SMTP server that saves all mail to a folder? [closed]

Answer 1

• Papercut
• Neptune
• SMTP4Dev
• Dumbster
• DevNull SMTP

Taken from this question.

Answer 2

There is the python DebuggingServer as well part of the standard library :

http://docs.python.org/library/smtpd.html#debuggingserver-objects

it will print everything on stdout.