The mailing list for listmasters using Sympa

[address@concealed]

Hi Adam

> On May 28, 2024, at 18:41, Adam Bernstein <address@concealed> wrote:
> 
> 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!

I've been using this exact same solution for years. Works great for Outlook 
users.


Francis