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# go-imap
[](https://godocs.io/github.com/emersion/go-imap)
[](https://builds.sr.ht/~emersion/go-imap/commits/master?)
An [IMAP4rev1](https://tools.ietf.org/html/rfc3501) library written in Go. It
can be used to build a client and/or a server.
## Usage
### Client [](https://godocs.io/github.com/emersion/go-imap/client)
```go
package main
import (
"log"
"github.com/emersion/go-imap/client"
"github.com/emersion/go-imap"
)
func main() {
log.Println("Connecting to server...")
// Connect to server
c, err := client.DialTLS("mail.example.org:993", nil)
if err != nil {
log.Fatal(err)
}
log.Println("Connected")
// Don't forget to logout
defer c.Logout()
// Login
if err := c.Login("username", "password"); err != nil {
log.Fatal(err)
}
log.Println("Logged in")
// List mailboxes
mailboxes := make(chan *imap.MailboxInfo, 10)
done := make(chan error, 1)
go func () {
done <- c.List("", "*", mailboxes)
}()
log.Println("Mailboxes:")
for m := range mailboxes {
log.Println("* " + m.Name)
}
if err := <-done; err != nil {
log.Fatal(err)
}
// Select INBOX
mbox, err := c.Select("INBOX", false)
if err != nil {
log.Fatal(err)
}
log.Println("Flags for INBOX:", mbox.Flags)
// Get the last 4 messages
from := uint32(1)
to := mbox.Messages
if mbox.Messages > 3 {
// We're using unsigned integers here, only subtract if the result is > 0
from = mbox.Messages - 3
}
seqset := new(imap.SeqSet)
seqset.AddRange(from, to)
messages := make(chan *imap.Message, 10)
done = make(chan error, 1)
go func() {
done <- c.Fetch(seqset, []imap.FetchItem{imap.FetchEnvelope}, messages)
}()
log.Println("Last 4 messages:")
for msg := range messages {
log.Println("* " + msg.Envelope.Subject)
}
if err := <-done; err != nil {
log.Fatal(err)
}
log.Println("Done!")
}
```
### Server [](https://godocs.io/github.com/emersion/go-imap/server)
```go
package main
import (
"log"
"github.com/emersion/go-imap/server"
"github.com/emersion/go-imap/backend/memory"
)
func main() {
// Create a memory backend
be := memory.New()
// Create a new server
s := server.New(be)
s.Addr = ":1143"
// Since we will use this server for testing only, we can allow plain text
// authentication over unencrypted connections
s.AllowInsecureAuth = true
log.Println("Starting IMAP server at localhost:1143")
if err := s.ListenAndServe(); err != nil {
log.Fatal(err)
}
}
```
You can now use `telnet localhost 1143` to manually connect to the server.
## Extensions
Support for several IMAP extensions is included in go-imap itself. This
includes:
* [APPENDLIMIT](https://tools.ietf.org/html/rfc7889)
* [CHILDREN](https://tools.ietf.org/html/rfc3348)
* [ENABLE](https://tools.ietf.org/html/rfc5161)
* [IDLE](https://tools.ietf.org/html/rfc2177)
* [IMPORTANT](https://tools.ietf.org/html/rfc8457)
* [LITERAL+](https://tools.ietf.org/html/rfc7888)
* [MOVE](https://tools.ietf.org/html/rfc6851)
* [SASL-IR](https://tools.ietf.org/html/rfc4959)
* [SPECIAL-USE](https://tools.ietf.org/html/rfc6154)
* [UNSELECT](https://tools.ietf.org/html/rfc3691)
Support for other extensions is provided via separate packages. See below.
## Extending go-imap
### Extensions
Commands defined in IMAP extensions are available in other packages. See [the
wiki](https://github.com/emersion/go-imap/wiki/Using-extensions#using-client-extensions)
to learn how to use them.
* [COMPRESS](https://github.com/emersion/go-imap-compress)
* [ID](https://github.com/ProtonMail/go-imap-id)
* [METADATA](https://github.com/emersion/go-imap-metadata)
* [NAMESPACE](https://github.com/foxcpp/go-imap-namespace)
* [QUOTA](https://github.com/emersion/go-imap-quota)
* [SORT and THREAD](https://github.com/emersion/go-imap-sortthread)
* [UIDPLUS](https://github.com/emersion/go-imap-uidplus)
### Server backends
* [Memory](https://github.com/emersion/go-imap/tree/master/backend/memory) (for testing)
* [Multi](https://github.com/emersion/go-imap-multi)
* [PGP](https://github.com/emersion/go-imap-pgp)
* [Proxy](https://github.com/emersion/go-imap-proxy)
* [Notmuch](https://github.com/stbenjam/go-imap-notmuch) - Experimental gateway for [Notmuch](https://notmuchmail.org/)
### Related projects
* [go-message](https://github.com/emersion/go-message) - parsing and formatting MIME and mail messages
* [go-msgauth](https://github.com/emersion/go-msgauth) - handle DKIM, DMARC and Authentication-Results
* [go-pgpmail](https://github.com/emersion/go-pgpmail) - decrypting and encrypting mails with OpenPGP
* [go-sasl](https://github.com/emersion/go-sasl) - sending and receiving SASL authentications
* [go-smtp](https://github.com/emersion/go-smtp) - building SMTP clients and servers
## License
MIT
|
