OptionsOn swaks itself
--to-t
Comma-separated recipient addresses. <to>
--from-f
Envelope sender <from>
--server-s
Host or IP, optionally host:port. <server>
--protocol
Protocol <protocol>
--tls-on-connect-tlsc
TLS on connect
--auth-a
Try authentication with the user and password below.
--auth-user-au
Auth user <auth_user>
--auth-password-ap
Visible in shell history; prefer leaving it unset so Swaks prompts. <auth_password>
--header
Header and data, e.g. Subject: hello. <header>
--attach
Attachment <attach>
--quit-after-q
Stop after <quit_after>
--suppress-data-n
Summarise DATA
