Include references header in emails #10206
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I'd like to add a References header to notification emails to allow mail client to show it threaded.
This allows a mail client to group mails from the same service such that a recovery is directly below a warning or critical.
That makes it easier to see if a problem is already resolved.
There is one more line in each file that call the mail command (for non-debian). But not all systems seem to support the
-a
option. e.g. Alma linux which came with S-NAIL as mua does not support it, there--custom-header=..
seems to be the option.