Comment by frumplestlatz

Comment by frumplestlatz 3 days ago

I think can still do it, 30 years after I last had to. The trauma of debugging sendmail m4 config issues for hours while the company e-mail remained dysfunctional has permanently etched it into my mind.

  EHLO example.com
  MAIL FROM:<foo@example.com>
  RCPT TO:<bar@example.com>
  DATA
  Subject: Hello, World

  I have crawled through the depths of hell to deliver unto you this message.
  .

Wietse Venema saved us all.

eqvinox 3 days ago

I haven't worked at sendmail or even anything e-mail related, and I can do that… just enough e-mail fixing as side work. Let's call it sysadmin calluses.

What made me stumble recently was having to talk LMTP to fix a mailman setup. Cheeky fuckers changed EHLO into LHLO for LMTP. (To avoid any mixups between the protocols, which is fair.)

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Izkata 3 days ago

From and To should be repeated below DATA, those are the actual email headers. And From at least doesn't need to match MAIL FROM.

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nedt 2 days ago

Also TO doesn't need to match. When you send to a group of BCC the envelope To has to specify the exact recipient, but the DATA doesn't. Similar with the envelope From and the one in the DATA - also useful to control bounces or who gets a reply.
Yeah I know the protocol and can do that manual, because I had to debug it often enough.

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