Mailstrom handles email delivery in a background worker thread, with the following
features:
- Accepts an email from the caller and then does everything necessary to get it
delivered to all recipients without blocking the caller.
- Allows the caller to query the status of an earlier submitted email at any time,
to determine if it is Queued, Delivered, Deferred, or has Failed, with details
as to why, on a per-recipient basis.
- Handles all parsing, validation, and encoding of email content and headers,
in compliance with RFC 5322 (and other RFCs). Uses the
email-format library for this.
- Looks up the DNS MX records of the recipients, and delivers directly to those Internet
mail servers over SMTP, thus not requiring any local SMTP relay. Uses the
resolv library for DNS lookups (via your
operating system)
- SMTP transport "heavy lifting" is performed via the lettre
library. Uses STARTTLS where available.
- Retries with exponential backoff for a fixed number of retries (currently fixed at 3),
when the send result is Deferred
- Uses a pluggable user-defined state management (persistence) layer.
- Only works on glibc based operating systems, due to usage of the
resolv
library.
- The email-format crate is somewhat incomplete
and clunky still. It doesn't incorporate RFC 6854 (updated From and Sender syntax) yet.
It defines types one-to-one with ABNF parsing units, rather than as semantic units of meaning.
And it doesn't let you use obvious types yet like setting the date from a DateTime type.
However, these issues will be worked out in the near future.
You can use it as follows:
extern crate email_format;
extern crate mailstrom;
use email_format::Email;
use mailstrom::{Mailstrom, Config, MemoryStorage};
fn main() {
let mut email = Email::new(
"myself@mydomain.com",
"Wed, 05 Jan 2015 15:13:05 +1300"
).unwrap();
email.set_bcc("myself@mydomain.com").unwrap();
email.set_sender("from_myself@mydomain.com").unwrap();
email.set_reply_to("My Mailer <no-reply@mydomain.com>").unwrap();
email.set_to("You <you@yourdomain.com>, AndYou <andyou@yourdomain.com>").unwrap();
email.set_cc("Our Friend <friend@frienddomain.com>").unwrap();
email.set_subject("Hello Friend").unwrap();
email.set_body("Good to hear from you.\r\n\
I wish you the best.\r\n\
\r\n\
Your Friend").unwrap();
let mut mailstrom = Mailstrom::new(
Config {
helo_name: "my.host.domainname".to_owned(),
},
MemoryStorage::new());
let message_id = mailstrom.send_email(email).unwrap();
let status = mailstrom.query_status(&*message_id).unwrap();
println!("{:?}", status);
}
error |
|
internal_status |
This is exposed for implementers of MailstromStorage but otherwise should not
be needed by users of this library.
|
status |
|