Emails sent from a Thunderbird identity I retain the 'from' address of the original gmail account.
I'm using Thunderbird 14 on a portable installation with Google as provider, Lightning and Mail Merge. I have set up a Thunderbird account with different identities. I have another account (email@example.com) which forwards to my Gmail account (firstname.lastname@example.org). I have set up an identity on my Thunderbird account which has the email and reply to account set to email@example.com.
So I select firstname.lastname@example.org in the 'from field' when sending emails. However, any emails I send like this from email@example.com appear to recipients as sent from firstname.lastname@example.org, although it keeps the identity specific signature but not the 'sent from' field.
The precise set up for my Gmail alias community@gietc.
The problem remains the same if I leave the reply-to field blank:
Yet when I send emails like this, although the signature remains, the email is sent 'from' my Gmail, and not the identity: