Add ssmtp for sendmail email

[jrmoserbaltimore]

There is no sendmail installed. This change adds ssmtp, a small, stand-alone sendmail.

By running the container with /etc/ssmtp/ssmtp.conf as a volume, the administrator can use a centralized configuration: if the administrator's default mail gateway changes, he can update the host ssmtp.conf to reflect the change to all Docker containers using ssmtp.

ssmtp configuration file would look as below:

# SSMTP configuration so sendmail works
# relays to our internal server
root=postmaster
Mailhub=smtp.example.com
hostname=docker-01.example.com
FromLineOverride=YES

[pierreozoux]

Already tried :)

Not gonna happen apparently, but nice to see one more voice on this issue ;)

docker-library/official-images#1203
docker-library/wordpress#30

[tianon]

Installing SSMTP seems like an OK compromise -- my problem in docker-library/official-images#1203 is that some default hard-coded configuration was applied with no way to override it. Just installing the package is IMO a good middle ground so that users can provide their own configuration themselves.

It looks like the whitespace here is a little off -- would you mind updating to tabs?

[pierreozoux]

Ok, I actually just remembered, ownCloud is one of the few good student out there.
You can configure mail though web interface or config file.

Here is what I use:

 'mail_domain' => 'indie.host',
'mail_from_address' => 'cloud',
'mail_smtpmode' => 'smtp',
'mail_smtphost' => 'mail.indie.host',
'mail_smtpport' => '587',
'mail_smtpauth' => 1,
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpname' => '[email protected]',
'mail_smtppassword' => 'xxx',

no need for any ssmtp or whatsover. Isn't it a good news? :)

[tianon]

🎉 ! 👍 ❤️

[md5]

Ok, I actually just remembered, ownCloud is one of the few good student out there.

What drives me crazy about this whole thing is that PHP supports SMTP for mail on Windows but not on any other platform. I see that as the root cause of (most) PHP applications not supporting direct SMTP connections out of the box.