The mailing list for listmasters using Sympa

[Adam Bernstein <address@concealed>]

There are a number of issues that we see affecting different sets of 
users differently, for which we end up creating our own little code 
patches for Sympa. But it's always a mystery how other people are 
dealing with them - or could we possibly be the only ones seeing them??

So here is one that came up recently. Almost all of our users were 
seeing the From: line displayed correctly like:

    "From: Sender (via listname list)"
or  "From: Sender (via listname list) <address@concealed>"

But not users of Microsoft's Outlook.com service (maybe only paid domain 
hosting users, not the generic freemail service). Instead, they were 
seeing this complicated, unreadable mess:

  "From: address@concealed 
address@concealed on behalf of Sender (via listname 
list) address@concealed"

After some research, we learned that is due to the way Microsoft handles 
the Sender: header - if it's different than the From: header, they 
combine both and display it all in the format above. (See 
https://help.mailgun.com/hc/en-us/articles/360012491394-Why-would-an-email-display-On-behalf-of.)

We solved the problem by stripping off the Sender: header entirely, via 
the remove_outgoing_headers setting in sympa.conf:

  remove_outgoing_headers    Sender

but is it just us who have had to do that? We'd love to know, thanks!

     adam

--
Adam Bernstein (he/him)
Electric Embers Cooperative
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electricembers.coop
(415) 992-6916