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46
CHANGELOG.md Normal file
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@ -0,0 +1,46 @@
# Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [Unreleased]
### Added
### Changed
### Removed
## [2.4.1] - 2021-01-12
### Changed
- Handle empty-set inputs to `fetch` and `uid_fetch` (#177)
## [2.4.0] - 2020-12-15
### Added
- `append_with_flags_and_date` (#174)
## [2.3.0] - 2020-08-23
### Added
- `append_with_flags` (#171)
## [2.2.0] - 2020-07-27
### Added
- Changelog
- STARTTLS example (#165)
- Timeout example (#168)
- Export `Result` and `Error` types (#170)
### Changed
- MSRV increased
- Better documentation of server greeting handling (#168)
[Unreleased]: https://github.com/jonhoo/rust-imap/compare/v2.4.1...HEAD
[2.4.1]: https://github.com/jonhoo/rust-imap/compare/v2.4.0...v2.4.1
[2.4.0]: https://github.com/jonhoo/rust-imap/compare/v2.3.0...v2.4.0
[2.3.0]: https://github.com/jonhoo/rust-imap/compare/v2.2.0...v2.3.0
[2.2.0]: https://github.com/jonhoo/rust-imap/compare/v2.1.2...v2.2.0

20
Cargo.toml
View file

@ -1,26 +1,18 @@
[package]
name = "imap"
version = "2.1.2"
authors = ["Matt McCoy <mattnenterprise@yahoo.com>",
"Jon Gjengset <jon@thesquareplanet.com>"]
version = "3.0.0-alpha.1"
authors = ["Jon Gjengset <jon@thesquareplanet.com>",
"Matt McCoy <mattnenterprise@yahoo.com>"]
documentation = "https://docs.rs/imap/"
repository = "https://github.com/jonhoo/rust-imap"
homepage = "https://github.com/jonhoo/rust-imap"
description = "IMAP client for Rust"
readme = "README.md"
license = "Apache-2.0/MIT"
license = "Apache-2.0 OR MIT"
edition = "2018"
keywords = ["email", "imap"]
categories = ["email", "network-programming"]
[badges]
azure-devops = { project = "jonhoo/jonhoo", pipeline = "imap", build = "11" }
codecov = { repository = "jonhoo/rust-imap", branch = "master", service = "github" }
maintenance = { status = "actively-developed" }
is-it-maintained-issue-resolution = { repository = "jonhoo/rust-imap" }
is-it-maintained-open-issues = { repository = "jonhoo/rust-imap" }
[features]
tls = ["native-tls"]
default = ["tls"]
@ -31,14 +23,14 @@ regex = "1.0"
bufstream = "0.1"
imap-proto = "0.10.0"
nom = "5.0"
base64 = "0.12"
base64 = "0.13"
chrono = "0.4"
lazy_static = "1.4"
[dev-dependencies]
lettre = "0.9"
lettre_email = "0.9"
rustls-connector = "0.11.0"
rustls-connector = "0.13.0"
[[example]]
name = "basic"

19
azure-pipelines.yml
View file

@ -25,9 +25,6 @@ jobs:
- template: install-rust.yml@templates
parameters:
rust: $(rust)
components:
- rustfmt
- clippy
- script: cargo check --all-targets
displayName: cargo check
- script: cargo test --examples
@ -36,10 +33,16 @@ jobs:
displayName: cargo test --doc
- script: cargo test --lib
displayName: cargo test --lib
- script: cargo fmt --all -- --check
- script: |
set -e
rustup component add rustfmt
cargo fmt --all -- --check
displayName: cargo fmt --check
condition: and(eq( variables['rust'], 'beta' ), eq( variables['Agent.OS'], 'Linux' ))
- script: cargo clippy -- -D warnings
- script: |
set -e
rustup component add clippy
cargo clippy -- -D warnings
displayName: cargo clippy
condition: and(eq( variables['rust'], 'beta' ), eq( variables['Agent.OS'], 'Linux' ))
# This represents the minimum Rust version supported.
@ -52,7 +55,7 @@ jobs:
steps:
- template: install-rust.yml@templates
parameters:
rust: 1.40.0
rust: 1.40.0 # static-assertions (1.37+) and base64 (1.40+)
- script: cargo check
displayName: cargo check
- job: integration
@ -79,11 +82,11 @@ resources:
- repository: templates
type: github
name: crate-ci/azure-pipelines
ref: refs/heads/v0.3
ref: refs/heads/v0.4
endpoint: jonhoo
containers:
- container: greenmail
image: greenmail/standalone:1.5.11
image: greenmail/standalone:1.5.13
ports:
- 3025:3025
- 3110:3110

1
examples/README.md
View file

@ -7,3 +7,4 @@ Examples:
* basic - This is a very basic example of using the client.
* gmail_oauth2 - This is an example using oauth2 for logging into gmail as a secure appplication.
* rustls - This demonstrates how to use Rustls instead of Openssl for secure connections (helpful for cross compilation).
* timeout - This demonstrates how to use timeouts while connecting to an IMAP server.

63
examples/starttls.rs Normal file
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@ -0,0 +1,63 @@
/**
* Here's an example showing how to connect to the IMAP server with STARTTLS.
* The only difference with the `basic.rs` example is when using `imap::connect_starttls()` method
* instead of `imap::connect()` (l. 52), and so you can connect on port 143 instead of 993
* as you have to when using TLS the entire way.
*
* The following env vars are expected to be set:
* - IMAP_HOST
* - IMAP_USERNAME
* - IMAP_PASSWORD
* - IMAP_PORT (supposed to be 143)
*/
extern crate imap;
extern crate native_tls;
use native_tls::TlsConnector;
use std::env;
use std::error::Error;
fn main() -> Result<(), Box<dyn Error>> {
let imap_host = env::var("IMAP_HOST").expect("Missing or invalid env var: IMAP_HOST");
let imap_username =
env::var("IMAP_USERNAME").expect("Missing or invalid env var: IMAP_USERNAME");
let imap_password =
env::var("IMAP_PASSWORD").expect("Missing or invalid env var: IMAP_PASSWORD");
let imap_port: u16 = env::var("IMAP_PORT")
.expect("Missing or invalid env var: IMAP_PORT")
.to_string()
.parse()
.unwrap();
if let Some(_email) = fetch_inbox_top(imap_host, imap_username, imap_password, imap_port)? {
eprintln!("OK :)");
}
Ok(())
}
fn fetch_inbox_top(
host: String,
username: String,
password: String,
port: u16,
) -> Result<Option<String>, Box<dyn Error>> {
let domain: &str = host.as_str();
let tls = TlsConnector::builder().build().unwrap();
// we pass in the domain twice to check that the server's TLS
// certificate is valid for the domain we're connecting to.
let client = imap::connect_starttls((domain, port), domain, &tls).unwrap();
// the client we have here is unauthenticated.
// to do anything useful with the e-mails, we need to log in
let mut _imap_session = client
.login(username.as_str(), password.as_str())
.map_err(|e| e.0)?;
// TODO Here you can process as you want. eg. search/fetch messages according to your needs.
// This returns `Ok(None)` for the need of the example
Ok(None)
}

92
examples/timeout.rs Normal file
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@ -0,0 +1,92 @@
extern crate imap;
extern crate native_tls;
use imap::Client;
use native_tls::TlsConnector;
use native_tls::TlsStream;
use std::env;
use std::error::Error;
use std::fmt;
use std::net::{SocketAddr, TcpStream, ToSocketAddrs};
use std::time::Duration;
fn main() -> Result<(), Box<dyn Error>> {
let server = env::var("IMAP_SERVER")?;
let port = env::var("IMAP_PORT").unwrap_or_else(|_| String::from("993"));
let port = port.parse()?;
let username = env::var("IMAP_USER")?;
let password = env::var("IMAP_PASSWORD")?;
let timeout = env::var("IMAP_TIMEOUT").unwrap_or_else(|_| String::from("1"));
let timeout = timeout.parse()?;
let timeout = Duration::from_secs(timeout);
let tls = TlsConnector::builder().build()?;
let client = connect_all_timeout((server.as_str(), port), server.as_str(), &tls, timeout)?;
let mut session = client.login(&username, &password).map_err(|e| e.0)?;
// do something productive with session
session.logout()?;
Ok(())
}
// connect to an IMAP host with a `Duration` timeout; note that this accepts only a single
// `SocketAddr` while `connect_all_timeout` does resolve the DNS entry and try to connect to all;
// this is necessary due to the difference of the function signatures of `TcpStream::connect` and
// `TcpStream::connect_timeout`
fn connect_timeout<S: AsRef<str>>(
addr: &SocketAddr,
domain: S,
ssl_connector: &TlsConnector,
timeout: Duration,
) -> Result<Client<TlsStream<TcpStream>>, Box<dyn Error>> {
// the timeout is actually used with the initial TcpStream
let tcp_stream = TcpStream::connect_timeout(addr, timeout)?;
let tls_stream = TlsConnector::connect(ssl_connector, domain.as_ref(), tcp_stream)?;
let mut client = Client::new(tls_stream);
// don't forget to wait for the IMAP protocol server greeting ;)
client.read_greeting()?;
Ok(client)
}
// resolve address and try to connect to all in order; note that this function is required to fully
// mimic `imap::connect` with the usage of `ToSocketAddrs`
fn connect_all_timeout<A: ToSocketAddrs, S: AsRef<str>>(
addr: A,
domain: S,
ssl_connector: &TlsConnector,
timeout: Duration,
) -> Result<Client<TlsStream<TcpStream>>, Box<dyn Error>> {
let addrs = addr.to_socket_addrs()?;
for addr in addrs {
match connect_timeout(&addr, &domain, ssl_connector, timeout) {
Ok(client) => return Ok(client),
Err(error) => eprintln!("couldn't connect to {}: {}", addr, error),
}
}
Err(Box::new(TimeoutError))
}
// very simple timeout error; instead of printing the errors immediately like in
// `connect_all_timeout`, you may want to collect and return them
#[derive(Debug)]
struct TimeoutError;
impl fmt::Display for TimeoutError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "all addresses failed to connect")
}
}
impl Error for TimeoutError {}

173
src/client.rs
View file

@ -1,5 +1,6 @@
use base64;
use bufstream::BufStream;
use chrono::{DateTime, FixedOffset};
#[cfg(feature = "tls")]
use native_tls::{TlsConnector, TlsStream};
use nom;
@ -27,15 +28,74 @@ macro_rules! quote {
};
}
trait OptionExt<E> {
fn err(self) -> std::result::Result<(), E>;
}
impl<E> OptionExt<E> for Option<E> {
fn err(self) -> std::result::Result<(), E> {
match self {
Some(e) => Err(e),
None => Ok(()),
}
}
}
/// Convert the input into what [the IMAP
/// grammar](https://tools.ietf.org/html/rfc3501#section-9)
/// calls "quoted", which is reachable from "string" et al.
/// Also ensure it doesn't contain a colliding command-delimiter (newline).
fn validate_str(value: &str) -> Result<String> {
let quoted = quote!(value);
if quoted.find('\n').is_some() {
return Err(Error::Validate(ValidateError('\n')));
validate_str_noquote(value)?;
Ok(quote!(value))
}
if quoted.find('\r').is_some() {
return Err(Error::Validate(ValidateError('\r')));
/// Ensure the input doesn't contain a command-terminator (newline), but don't quote it like
/// `validate_str`.
/// This is helpful for things like the FETCH attributes, which,
/// per [the IMAP grammar](https://tools.ietf.org/html/rfc3501#section-9) may not be quoted:
///
/// > fetch = "FETCH" SP sequence-set SP ("ALL" / "FULL" / "FAST" /
/// > fetch-att / "(" fetch-att *(SP fetch-att) ")")
/// >
/// > fetch-att = "ENVELOPE" / "FLAGS" / "INTERNALDATE" /
/// > "RFC822" [".HEADER" / ".SIZE" / ".TEXT"] /
/// > "BODY" ["STRUCTURE"] / "UID" /
/// > "BODY" section ["<" number "." nz-number ">"] /
/// > "BODY.PEEK" section ["<" number "." nz-number ">"]
///
/// Note the lack of reference to any of the string-like rules or the quote characters themselves.
fn validate_str_noquote(value: &str) -> Result<&str> {
value
.matches(|c| c == '\n' || c == '\r')
.next()
.and_then(|s| s.chars().next())
.map(|offender| Error::Validate(ValidateError(offender)))
.err()?;
Ok(value)
}
Ok(quoted)
/// This ensures the input doesn't contain a command-terminator or any other whitespace
/// while leaving it not-quoted.
/// This is needed because, per [the formal grammer given in RFC
/// 3501](https://tools.ietf.org/html/rfc3501#section-9), a sequence set consists of the following:
///
/// > sequence-set = (seq-number / seq-range) *("," sequence-set)
/// > seq-range = seq-number ":" seq-number
/// > seq-number = nz-number / "*"
/// > nz-number = digit-nz *DIGIT
/// > digit-nz = %x31-39
///
/// Note the lack of reference to SP or any other such whitespace terminals.
/// Per this grammar, in theory we ought to be even more restrictive than "no whitespace".
fn validate_sequence_set(value: &str) -> Result<&str> {
value
.matches(|c: char| c.is_ascii_whitespace())
.next()
.and_then(|s| s.chars().next())
.map(|offender| Error::Validate(ValidateError(offender)))
.err()?;
Ok(value)
}
/// An authenticated IMAP session providing the usual IMAP commands. This type is what you get from
@ -240,6 +300,29 @@ impl<T: Read + Write> Client<T> {
///
/// This method primarily exists for writing tests that mock the underlying transport, but can
/// also be used to support IMAP over custom tunnels.
///
/// **Note:** In case you do need to use `Client::new` over `imap::connect`, you will need to
/// listen for the IMAP protocol server greeting before authenticating:
///
/// ```rust,no_run
/// # extern crate imap;
/// # extern crate native_tls;
/// # use imap::Client;
/// # use native_tls::TlsConnector;
/// # use std::io;
/// # use std::net::TcpStream;
/// # fn main() {
/// # let server = "imap.example.com";
/// # let username = "";
/// # let password = "";
/// # let tcp = TcpStream::connect((server, 993)).unwrap();
/// # let ssl_connector = TlsConnector::builder().build().unwrap();
/// # let tls = TlsConnector::connect(&ssl_connector, server.as_ref(), tcp).unwrap();
/// let mut client = Client::new(tls);
/// client.read_greeting().unwrap();
/// let session = client.login(username, password).unwrap();
/// # }
/// ```
pub fn new(stream: T) -> Client<T> {
Client {
conn: Connection {
@ -456,7 +539,7 @@ impl<T: Read + Write> Session<T> {
.and_then(|lines| parse_mailbox(&lines[..], &mut self.unsolicited_responses_tx))
}
/// Fetch retreives data associated with a set of messages in the mailbox.
/// Fetch retrieves data associated with a set of messages in the mailbox.
///
/// Note that the server *is* allowed to unilaterally include `FETCH` responses for other
/// messages in the selected mailbox whose status has changed. See the note on [unilateral
@ -519,13 +602,17 @@ impl<T: Read + Write> Session<T> {
S1: AsRef<str>,
S2: AsRef<str>,
{
if sequence_set.as_ref().is_empty() {
parse_fetches(vec![], &mut self.unsolicited_responses_tx)
} else {
self.run_command_and_read_response(&format!(
"FETCH {} {}",
sequence_set.as_ref(),
query.as_ref()
validate_sequence_set(sequence_set.as_ref())?,
validate_str_noquote(query.as_ref())?
))
.and_then(|lines| parse_fetches(lines, &mut self.unsolicited_responses_tx))
}
}
/// Equivalent to [`Session::fetch`], except that all identifiers in `uid_set` are
/// [`Uid`]s. See also the [`UID` command](https://tools.ietf.org/html/rfc3501#section-6.4.8).
@ -534,13 +621,17 @@ impl<T: Read + Write> Session<T> {
S1: AsRef<str>,
S2: AsRef<str>,
{
if uid_set.as_ref().is_empty() {
parse_fetches(vec![], &mut self.unsolicited_responses_tx)
} else {
self.run_command_and_read_response(&format!(
"UID FETCH {} {}",
uid_set.as_ref(),
query.as_ref()
validate_sequence_set(uid_set.as_ref())?,
validate_str_noquote(query.as_ref())?
))
.and_then(|lines| parse_fetches(lines, &mut self.unsolicited_responses_tx))
}
}
/// Noop always succeeds, and it does nothing.
pub fn noop(&mut self) -> Result<()> {
@ -1055,10 +1146,68 @@ impl<T: Read + Write> Session<T> {
/// `EXISTS` response. If the server does not do so, the client MAY issue a `NOOP` command (or
/// failing that, a `CHECK` command) after one or more `APPEND` commands.
pub fn append<S: AsRef<str>, B: AsRef<[u8]>>(&mut self, mailbox: S, content: B) -> Result<()> {
self.append_with_flags(mailbox, content, &[])
}
/// The [`APPEND` command](https://tools.ietf.org/html/rfc3501#section-6.3.11) can take
/// an optional FLAGS parameter to set the flags on the new message.
///
/// > If a flag parenthesized list is specified, the flags SHOULD be set
/// > in the resulting message; otherwise, the flag list of the
/// > resulting message is set to empty by default. In either case, the
/// > Recent flag is also set.
///
/// The [`\Recent` flag](https://tools.ietf.org/html/rfc3501#section-2.3.2) is not
/// allowed as an argument to `APPEND` and will be filtered out if present in `flags`.
pub fn append_with_flags<S: AsRef<str>, B: AsRef<[u8]>>(
&mut self,
mailbox: S,
content: B,
flags: &[Flag<'_>],
) -> Result<()> {
self.append_with_flags_and_date(mailbox, content, flags, None)
}
/// The [`APPEND` command](https://tools.ietf.org/html/rfc3501#section-6.3.11) can take
/// an optional FLAGS parameter to set the flags on the new message.
///
/// > If a flag parenthesized list is specified, the flags SHOULD be set
/// > in the resulting message; otherwise, the flag list of the
/// > resulting message is set to empty by default. In either case, the
/// > Recent flag is also set.
///
/// The [`\Recent` flag](https://tools.ietf.org/html/rfc3501#section-2.3.2) is not
/// allowed as an argument to `APPEND` and will be filtered out if present in `flags`.
///
/// Pass a date in order to set the date that the message was originally sent.
///
/// > If a date-time is specified, the internal date SHOULD be set in
/// > the resulting message; otherwise, the internal date of the
/// > resulting message is set to the current date and time by default.
pub fn append_with_flags_and_date<S: AsRef<str>, B: AsRef<[u8]>>(
&mut self,
mailbox: S,
content: B,
flags: &[Flag<'_>],
date: impl Into<Option<DateTime<FixedOffset>>>,
) -> Result<()> {
let content = content.as_ref();
let flagstr = flags
.iter()
.filter(|f| **f != Flag::Recent)
.map(|f| f.to_string())
.collect::<Vec<String>>()
.join(" ");
let datestr = match date.into() {
Some(date) => format!(" \"{}\"", date.format("%d-%h-%Y %T %z")),
None => "".to_string(),
};
self.run_command(&format!(
"APPEND \"{}\" {{{}}}",
"APPEND \"{}\" ({}){} {{{}}}",
mailbox.as_ref(),
flagstr,
datestr,
content.len()
))?;
let mut v = Vec::new();

1
src/lib.rs
View file

@ -87,6 +87,7 @@ mod client;
pub use crate::client::*;
pub mod error;
pub use error::{Error, Result};
pub mod extensions;

15
src/types/mod.rs
View file

@ -169,6 +169,21 @@ impl Flag<'static> {
}
}
impl<'a> fmt::Display for Flag<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
Flag::Seen => write!(f, "{}", "\\Seen"),
Flag::Answered => write!(f, "{}", "\\Answered"),
Flag::Flagged => write!(f, "{}", "\\Flagged"),
Flag::Deleted => write!(f, "{}", "\\Deleted"),
Flag::Draft => write!(f, "{}", "\\Draft"),
Flag::Recent => write!(f, "{}", "\\Recent"),
Flag::MayCreate => write!(f, "{}", "\\*"),
Flag::Custom(ref s) => write!(f, "{}", s),
}
}
}
impl<'a> From<String> for Flag<'a> {
fn from(s: String) -> Self {
if let Some(f) = Flag::system(&s) {

152
tests/imap_integration.rs
View file

@ -1,8 +1,10 @@
extern crate chrono;
extern crate imap;
extern crate lettre;
extern crate lettre_email;
extern crate native_tls;
use chrono::{FixedOffset, TimeZone};
use lettre::Transport;
use std::net::TcpStream;
@ -231,3 +233,153 @@ fn list() {
// TODO: make a subdir
}
#[test]
fn append() {
let to = "inbox-append1@localhost";
// make a message to append
let e: lettre::SendableEmail = lettre_email::Email::builder()
.from("sender@localhost")
.to(to)
.subject("My second e-mail")
.text("Hello world")
.build()
.unwrap()
.into();
// connect
let mut c = session(to);
let mbox = "INBOX";
c.select(mbox).unwrap();
//append
c.append(mbox, e.message_to_string().unwrap()).unwrap();
// now we should see the e-mail!
let inbox = c.uid_search("ALL").unwrap();
// and the one message should have the first message sequence number
assert_eq!(inbox.len(), 1);
let uid = inbox.into_iter().next().unwrap();
// fetch the e-mail
let fetch = c.uid_fetch(format!("{}", uid), "(ALL UID)").unwrap();
assert_eq!(fetch.len(), 1);
let fetch = &fetch[0];
assert_eq!(fetch.uid, Some(uid));
let e = fetch.envelope().unwrap();
assert_eq!(e.subject, Some(&b"My second e-mail"[..]));
// and let's delete it to clean up
c.uid_store(format!("{}", uid), "+FLAGS (\\Deleted)")
.unwrap();
c.expunge().unwrap();
// the e-mail should be gone now
let inbox = c.search("ALL").unwrap();
assert_eq!(inbox.len(), 0);
}
#[test]
fn append_with_flags() {
use imap::types::Flag;
let to = "inbox-append2@localhost";
// make a message to append
let e: lettre::SendableEmail = lettre_email::Email::builder()
.from("sender@localhost")
.to(to)
.subject("My third e-mail")
.text("Hello world")
.build()
.unwrap()
.into();
// connect
let mut c = session(to);
let mbox = "INBOX";
c.select(mbox).unwrap();
//append
let flags: &[Flag] = &[Flag::Seen, Flag::Flagged];
c.append_with_flags(mbox, e.message_to_string().unwrap(), flags)
.unwrap();
// now we should see the e-mail!
let inbox = c.uid_search("ALL").unwrap();
// and the one message should have the first message sequence number
assert_eq!(inbox.len(), 1);
let uid = inbox.into_iter().next().unwrap();
// fetch the e-mail
let fetch = c.uid_fetch(format!("{}", uid), "(ALL UID)").unwrap();
assert_eq!(fetch.len(), 1);
let fetch = &fetch[0];
assert_eq!(fetch.uid, Some(uid));
let e = fetch.envelope().unwrap();
assert_eq!(e.subject, Some(&b"My third e-mail"[..]));
// check the flags
let setflags = fetch.flags();
assert!(setflags.contains(&Flag::Seen));
assert!(setflags.contains(&Flag::Flagged));
// and let's delete it to clean up
c.uid_store(format!("{}", uid), "+FLAGS (\\Deleted)")
.unwrap();
c.expunge().unwrap();
// the e-mail should be gone now
let inbox = c.search("ALL").unwrap();
assert_eq!(inbox.len(), 0);
}
#[test]
fn append_with_flags_and_date() {
use imap::types::Flag;
let to = "inbox-append3@localhost";
// make a message to append
let e: lettre::SendableEmail = lettre_email::Email::builder()
.from("sender@localhost")
.to(to)
.subject("My third e-mail")
.text("Hello world")
.build()
.unwrap()
.into();
// connect
let mut c = session(to);
let mbox = "INBOX";
c.select(mbox).unwrap();
// append
let flags: &[Flag] = &[Flag::Seen, Flag::Flagged];
let date = FixedOffset::east(8 * 3600)
.ymd(2020, 12, 13)
.and_hms(13, 36, 36);
c.append_with_flags_and_date(mbox, e.message_to_string().unwrap(), flags, Some(date))
.unwrap();
// now we should see the e-mail!
let inbox = c.uid_search("ALL").unwrap();
// and the one message should have the first message sequence number
assert_eq!(inbox.len(), 1);
let uid = inbox.into_iter().next().unwrap();
// fetch the e-mail
let fetch = c.uid_fetch(format!("{}", uid), "(ALL UID)").unwrap();
assert_eq!(fetch.len(), 1);
let fetch = &fetch[0];
assert_eq!(fetch.uid, Some(uid));
assert_eq!(fetch.internal_date(), Some(date));
// and let's delete it to clean up
c.uid_store(format!("{}", uid), "+FLAGS (\\Deleted)")
.unwrap();
c.expunge().unwrap();
// the e-mail should be gone now
let inbox = c.search("ALL").unwrap();
assert_eq!(inbox.len(), 0);
}