Simple SMTP client that reads from, cc, bcc, and body from stdin.
stdout's output is entirely generated by env_logger and can be piped around if needed.
Optionally, the CLI accepts a -f argument that defines the Return-Path.
[devin@cert mailer]$ RUST_LOG=mailer cargo run -- -f bla@bounceme.com < test.mail
Compiling mailer v0.1.0 (/home/devin/src/mailer)
Finished dev [unoptimized + debuginfo] target(s) in 2.29s
Running `target/debug/mailer -f 'bla@bounceme.com'`
[2020-05-19T09:08:34Z TRACE mailer] Parsing arguments.
[2020-05-19T09:08:34Z DEBUG mailer] Cli { return_path: "bla@bounceme.com" }
[2020-05-19T09:08:34Z TRACE mailer] Parsing header.
[2020-05-19T09:08:34Z DEBUG mailer] field: subject, value: email subject!
[2020-05-19T09:08:34Z DEBUG mailer] field: from, value: from@blu.com
[2020-05-19T09:08:34Z DEBUG mailer] field: bcc, value: bcc@bla.com
[2020-05-19T09:08:34Z DEBUG mailer] field: cc, value: cc@bla.com
[2020-05-19T09:08:34Z TRACE mailer] Parsing body.
[2020-05-19T09:08:34Z DEBUG mailer] msg body:
Email Content line 1
Email Content line 2
[2020-05-19T09:08:34Z TRACE mailer] Setting Return-Path
[2020-05-19T09:08:34Z INFO mailer] succesfully sent. from: from@blu.com; to: devin@localhost; len: 41