It was disabled in ansible commit 16daf5eae8425aacfc4536e3818c0eb38cfe0c7d, for unknown reasons. This makes it impossible to just use localhost as mailhost, {{{127.0.0.1}}} needs to be used, which is less convenient and less future-proof.
This was done to try and solve a issue with outgoing emails from some internal hosts.
I've reverted it now and we can see if there's still any issue.
Thanks.
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