
How can I disable the appending of Message-ID in an outgoing email?
I send email through an SMTP server that appends a Message-ID to the headers, even if there is already one, and my provider has expressed inability, unwillingness, or refusal to change this behavior. But Thunderbird also appends a Message-ID, and this creates a situation where the email has two message-ID's, which causes it to get rejected as spam.
The error is as follows:
host mx10.mailspamprotection.com [184.154.48.170] SMTP error from remote mail server after end of data: 550 Messages should have one or no Message-ID headers, not 2.
How can I configure Thunderbird to not generate or append a Message-ID when sending an email?