Re:Show HN: Fake SMTP server as a service
by lagadu on Monday April 03, 2017 @10:43AM
(#14023081)
Personally I use Papercut and so far I'm pretty happy.
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If you don't need the complexity of a full-blown visualisation UI, you can just (assuming you have Python on the machine) run
python -m smtpd -n -c DebuggingServer localhost:1025
it will dump all mail to stdout.(change port as you see fit, below 1024 requires root/sudoing)