#rfc5322 #mime #smtp #template

deprecated mail

mail, facade for a number of mail related crates for creating and sending mails

13 releases

Uses old Rust 2015

0.7.0 Jun 6, 2020
0.6.12 Oct 11, 2019
0.6.10 Mar 26, 2019
0.6.7 Feb 14, 2019
0.1.0-unstable Mar 4, 2017

#6 in #rfc5322

Download history 23/week @ 2023-08-12 9/week @ 2023-08-19 21/week @ 2023-08-26 10/week @ 2023-09-02 38/week @ 2023-09-09 21/week @ 2023-09-16 22/week @ 2023-09-23 19/week @ 2023-09-30 15/week @ 2023-10-07 20/week @ 2023-10-14 37/week @ 2023-10-21 42/week @ 2023-10-28 11/week @ 2023-11-04 9/week @ 2023-11-11 24/week @ 2023-11-18 39/week @ 2023-11-25

88 downloads per month


53 lines


Documentation can be viewed on docs.rs.

Facade which re-exports functionality from a number of mail related crates.

The facade should re-export enough functionality for using the mail carate to create/modify/encode mail, send them over smtp (feature) or use a handlebars based template engine to create them from a template (feature).

Functionality steming from following crates is re-exported:

  • mail-core provides a Mail type and the core functionality around creating/modifing/encoding mails.
  • mail-headers provides implementations for the headers of the mail. This also includes a number of header components which appear in mail header bodies but are also re-used in other placed (e.g. MediaType stemming from the Content-Type header or Domain`).
  • mail-smtp bindings to new-tokio-smtp to make it easier to send mails over smtp. This also includes functionality to automatically derive the smtp sender/receiver from the mail if no sender/receiver is explicitly given (Smtp by it's standard does not use the From/To headers of a mail. Instead it treats the mail, including it's headers mostly as a opaque block of data. But in practice the addresses in From/To/Sender tend to match the smtp sender/recipient).
  • mail-template provides a simple way to bind template engine to generate mails. It has a feature which if enable directly includes bindings to handlebars. This feature is re-exported in the crate as the handlebars feature.
  • mail-internals provides some shared mostly internal parts the other crates use. This is normally only needed if you write your own mail header implementations. But even then the does this crate re-expost the parts most likely needed (in the header_encoding module).



Creates and encodes a simple mail without using any fancy helpers, templates or similar.


Uses the bindings for the handlebars template engine to create a mail, including alternate bodies and an attachment.


A simple program which queries the user for information and then sends a (simple) mail to an MSA (Mail Submission Agent). While it is currently limited to STARTTLS on port 587, Auth Plain and only simple text mails this is a limitation of this cli program not the mail libraries which can handle other forms of connecting and authenticating etc.

Note that this is meant to send data to an MSA NOT a MX (Mail Exchanger), e.g. smtp.gmail.com is a MSA but gmail-smtp-in.l.google.com is an MX. Also note that some mail providers do not accept Auth Plain (at least not without enabling it in the security settings). The reason for this is that they prefer that applications do not use username+password for authentication but other formats e.g. OAuth2 tokens.

Rest assured that the authentication data is only sent over a TLS encrypted channel. Still if you don't trust it consider using some throw away or testing mail service e.g. ethereal.email.

Lastly the examples uses the same unique seed every time, which means that Message-ID's, and Content-ID's are not guaranteed to be world unique even through they should (again a limitation of the example not the mail crate). Nevertheless given that it also doesn't use its "own" domain but a .test domain it can't guarantee world uniqueness anyway and would fail many spam filters, so if you use it make sure to change this to the right values for your use case.



Provides bindings to new-tokio-smtp under mail::smtp by reexporting the mail-smtp crate


Provides a mail-template engine implementation using the handlebars crate. It can be found under mail::template::handlebars::Handlebars;


Enables the traceing debugging functionality in the EncodingBuffer from mail-internals, this is only used for testing header implementations and comes with noticeable overhead. As such this should not be enabled except for testing header implementations. Also EncodingBuffer isn't re-exported as it can be seen as an internal part of the implementation which normally doesn't need to be accessed directly.


Licensed under either of

at your option.


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.


~275K SLoC