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Re:Show HN: Fake SMTP server as a service by recursive on Monday April 03, 2017 @10:20AM (#14022916)
SMTP4dev is a good option for Windows.
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.
Re:Show HN: Fake SMTP server as a service by masklinn on Monday April 03, 2017 @12:02PM (#14023894)
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)