--On Monday, May 03, 2021 2:05 PM +0100 Darac Marjal
<mailingl...@darac.org.uk> wrote:
If sendmail can't do that (I'm struggling to find
decent documentation for it), consider replacing sendmail with exim or
postfix - both of which DO have this capability.
I learned sendmail using the "bat book" from O'Reilly. (Popular publisher
of books on open source systems, with each book characterized by a notable
animal on the cover.)
<https://www.oreilly.com/library/view/sendmail-4th-edition/9780596510299/>
Alas, the online documentation got much harder to find when sendmail went
commercial. Some FAQs here:
<https://www.proofpoint.com/us/sendmail/faq>
Alas, sendmail was written at a time when the Internet was more trusting
and when software was less integrated, so authentication was bolted on as
an extra feature. I haven't found anything on rate-limiting it except as an
anti-spam measure.
Note that Red Hat distros switched to Postfix as the default mail server a
couple versions back but still provide sendmail as an alternative. So a
recent Fedora or CentOS system will likely be running Postfix.
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