Quoting Brian May ([email protected]):

> msmtp is interesting implementation of sendmail, because it lets
> individual users store their remote smtp servers in ~/.msmtprc.

The category of maximally simple, stripped-down utilities to do outbound
SMTP is collectively called 'nullmailers', after the name of the
earliest best known example.  I catalogue them here:

'Nullmailers' on http://linuxmafia.com/kb/Mail/ 

Note that some of them can do modern crypto extensions, most sadly not.


Ordinarily, I strongly favour full-service MTAs = SMTP daemons (Exim4,
Postfix, Courier-MTA), but there's one host where I opted for a
nullmailer anyway:  Silicon Valley Linux User Group's dedicated Web
server www.svlug.org has no SMTP functionality running on it (those
being on separate machine lists.svlug.org), but it's still desirable to 
send root's mail to someone offsystem so that an admin gets notified of
anything serious in the logs, etc.  So, nullmailer (does that job
minimally, doesn't add much to the public attack surface).


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