Sort the MIME Headers in outgoing emails

[bschmalhofer]

When debugging a problem with mails sent by OTOBO I noticed that the headers that were generated by OTOBO itself are in a random order. This isn't an actual problem, but it would be easier for debugging when there were a fixed order.
But maybe this is by design, so that there are no effects that rely on a fixed order.

test_16:15.txt
test_17:15.txt

[bschmalhofer]

This should not break anything. MIME::Entity::build() already has a preferred order of the standard headers. Only the X- headers, and maybe some other known headers, are sorted in the order they were passed in.

See

otobo/Kernel/System/Email.pm

Lines 1141 to 1145 in 748769d

	# build MIME::Entity, Data should be bytes, not utf-8
	# see http://bugs.otrs.org/show_bug.cgi?id=9832
	$EncodeObject->EncodeOutput( \$Param{Body} );
	my $Entity = MIME::Entity->build( %Header, Data => $Param{Body} );

.

[bschmalhofer]

Inspected a couple of mails and the orders of headers was reproducible. Looks good. Closing this issue.