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# go-smtp
[](https://pkg.go.dev/github.com/emersion/go-smtp)
[](https://builds.sr.ht/~emersion/go-smtp/commits?)
An ESMTP client and server library written in Go.
## Features
* ESMTP client & server implementing [RFC 5321]
* Support for additional SMTP extensions such as [AUTH] and [PIPELINING]
* UTF-8 support for subject and message
* [LMTP] support
## Relationship with net/smtp
The Go standard library provides a SMTP client implementation in `net/smtp`.
However `net/smtp` is frozen: it's not getting any new features. go-smtp
provides a server implementation and a number of client improvements.
## Licence
MIT
[RFC 5321]: https://tools.ietf.org/html/rfc5321
[AUTH]: https://tools.ietf.org/html/rfc4954
[PIPELINING]: https://tools.ietf.org/html/rfc2920
[LMTP]: https://tools.ietf.org/html/rfc2033
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