How about sending mail 500 miles more?
Just to be the man/woman/non-binary who sends mail 500 miles to your front door?
You had me at EHL0.
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> You had me at EHL0.
You just reminded me of my time working at Sendmail, where I often had to telnet to port 25 of some machine, and pretend to be a mail server sending email.
I used to be able to send all the commands without having to look them up. Not sure I could still do that today.
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.
.
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.)
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.
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.