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A comment on curl can be used to send emails with SMTP. Parent comment

Re:curl can be used to send emails with SMTP by 21sys on Sunday July 19, 2026 @09:55AM (#48968266)
me too, but more and more relays enforce tls or startssl (which is good!) and that's where telnet isn't a good fit imho.

I came across curl when I tested the mailgun.com smtp relay (mandatory tls + auth) and it worked immediately.

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Re:curl can be used to send emails with SMTP by mmh0000 on Sunday July 19, 2026 @10:42AM (#48968614)
If you really want to do things manually, like telnet but with ssl, see OpenSSLs sclient:

  openssl s_client -connect my.mailserver.com:465
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