[Mailman-Users] Mailman and Thunderbird

Mark Sapiro mark at msapiro.net
Wed Apr 20 11:26:49 EDT 2016

On 04/20/2016 01:14 AM, Christian F Buser via Mailman-Users wrote:
> A user complained that his Thunderbird mail application (on MacOS X, if this matters) does no longer treat incoming list mails properly - means, the message is treated by Thunderbird as if it was sent to his "default" mail address (we call it "A" for now) instead of the address he used to subscibe to the list (address "B").

I would have to know more about his actual T-bird configuration to
comment on that.

> This would not be a big problem - but when he replies to a list message, the reply is sent from "A" instead of "B", resulting in an error message from Mailman...

As Chris says, if he has more than one T-bird identity, when he composes
a reply, the From: in the composition window is a pull-down list from
which he can chose the identity he wants. I think this normally is the
identity that the original was addressed to, but he should have control
in any case.

> He has analysed the headers and compared with the old list setup headers. As far as he could see, the only difference was that Mailman list includes an "Envelope-To"-header with his subscription address, while the precious list version included a "Delivered-To"-header. 
> I am not a "mail header specialist", but I would guess that these two headers are added by the receiving mail server and not by the list software. Is this assumption correct? If not, can Mailman be configured to send the "Delivered-To"-header? 

Delivered-To: is added by Postfix and perhaps other MTA's in the
delivery chain (It's used by Postfix to detect mail loops). Envelope-To:
is added by some MTA. Mailman has nothing to do with either.

> And if there are by chance any Thunderbird-specialists among us: what can he do to correct the situation? 

I use T-bird, but I'm not sure exactly what headers it uses when
selecting a default From: address on a reply, but the user can always
select a different one, although that's a step that's easily forgotten.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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