Add support for multiple relayhosts

[terceiro]

[tersmitten]

Can you fix the failing tests?

See https://github.com/Oefenweb/ansible-cacti-spine/commit/6418105cdf29fdf0bda5390cf75450df9d57d831

[terceiro]

Can you fix the failing tests?

See Oefenweb/ansible-cacti-spine@6418105

Just did. I tried to do comparable changes to what was done in that commit, and pushed a new commit to this PR.

[tersmitten]

Multiple destinations are (only) supported in Postfix 3.5 and later, right?

[tersmitten]

https://serverfault.com/questions/763106/how-to-set-multiple-relayhost-in-postfix

[terceiro]

Multiple destinations are (only) supported in Postfix 3.5 and later, right?

Yes. What would be an acceptable way of handling that?

FWIW Debian 11 (oldoldstable) has Postfix 3.5, only older releases have ealier versions.

[tersmitten]

I mentioned it in the README

[tersmitten]

See https://github.com/Oefenweb/ansible-postfix/pull/150