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Recommendation for outgoing-only SMTP server (self.selfhosted)

submitted 8 months ago by markstos to c/selfhosted

34 comments fedilink hide all child comments

I'm looking for a simple sendmail replacement to receive local mail, such as from cron and service failures and forward it to on to a real SMTP server.

I have used msmtpd successfully but thought I'd ask if folks have other solutions they like.

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[–] vegetaaaaaaa 1 points 8 months ago* (last edited 8 months ago) (1 children)

You can definitely replace senders with correct mail addresses for relaying through SMTP servers that expect them (this is what I do):

# /etc/msmtprc
account default
...
host smtp.gmail.com
auto_from on
auth on
user myaddress
password hunter2

# Replace local recipients with addresses in the aliases file
aliases /etc/aliases

# /etc/aliases
mailer-daemon: postmaster
postmaster: root
nobody: root
hostmaster: root
usenet: root
news: root
webmaster: root
www: root
ftp: root
abuse: root
noc: root
security: root
root: default
www-data: root
default: [email protected]

(the only thing I changed from the defaults in the aliases file is adding the last line)

This makes it so all/most system accounts susceptible to send mail are aliased to root, and root in turn is aliased to my email address (which is the one configured in host/user/password in msmtprc)

Edit: I think it's actually the auto_from option which interests you. Check the msmtp manpage

[–] markstos 2 points 8 months ago (1 children)

In the issue I linked, the msmtp author makes a distinction with changing the envelope recipient, which msmtp can do, with rewriting the email headers like “To”, which msmtp does not do.

[–] vegetaaaaaaa 2 points 8 months ago

https://github.com/chriswayg/ansible-msmtp-mailer/issues/14 While msmtp has features to alter the envelope sender and recipient, it doesn't alter the "To:" or "From:" message itself. When the Envelope doesn't match these details, it can be considered spam

Oh I didn't know that, good to know!

The proposed one-line wrapper looks like a nice solution