How to configure exim with docker for sendmail

Question

I am using docker container for emails using this exim image

https://registry.hub.docker.com/u/tianon/exim4/

This works fine if i use smtp host as conatiner name in other website and

Now my joomla site is using sendmail and i am not able to figure out how to link sendmail with exim container

I get this error when try to send mail

Could not execute: /usr/sbin/sendmail

thats right because snedmail is not installed within joomla container but how can fix that

Answer 1

Just about all major MTAs support a "sendmail compatibility mode", and Exim does support that. The fix is simple. As root, do:

cd /usr/sbin
ln -s exim sendmail

Then when your application call /usr/sbin/sendmail and passes a message to it on STDIN, exim will parse the commandline options in a sendmail compatibility mode.

Answer 2

According to the documentation, Joomla has native support for sending mail to an SMTP server. However, if that won't work (e.g., if you have extensions that ignore Joomla's settings and always try to use a local sendmail binary), you can install a sendmail alternative that performs the necessary SMTP transaction for you.

A common solution is msmtp, which is often used by mutt users to provide SMTP server for the mutt mailer. The msmtp client is command-line compatible, so you can install msmtp and then:

ln -s /usr/bin/msmtp /usr/sbin/sendmail

Provided that you put the appropriate configuration in place, this should solve your problem.