Hello,

It could be the user needs to use the manage identities feature in Thunderbird. If you have an email address A that also has an alias address B, when you set up the email address A account in Thunderbird, it will use the A email address when you reply to messages even if the message was sent to the B email address. Using the Manage Identities feature (on the Account Settings page near the bottom), you can add the alias email address B. Once done, when you reply to a message sent to the A address, Thunderbird will use the A address for the From: field. When you reply to a message sent to the B address, Thunderbird will use the B address for the From: field. If you have multiple address that all consolidate to one address, this is a convenient way to receive mail and reply using the correct address for the reply.

Just a thought,
Chris

On 4/20/2016 1:14 AM, Christian F Buser via Mailman-Users wrote:
Hi all

I have no idea where this question belongs to... but there might be some 
knowing person out here, I hope!

We switched our lists to a new provider and now are using Mailman 2.1.20 from 
Cpanel.

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").

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...

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?

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

Thank you, Christian


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