Martin Brennan ff6114d83f
FIX: Do not add mailing list headers to group SMTP emails (#13431)
When we are emailing people from a group inbox, we are having
a PM conversation with them, as a support account would. In this
case mailing list headers do not make sense. It is not like a forum
topic where you may have tens or hundreds of participants -- it is a
conversation between the group and a small handful of people
directly contacting the group, often just one person.

The only header left in tact was List-Unsubsribe which is important
for letting people opt out to notifications.
2021-06-18 14:36:17 +10:00
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