Quote:
Originally Posted by TenFour
I don't think all email clients reveal that to the recipient. I wonder if Fastmail reveals that if you are sending via Thunderbird for example?
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Thunderbird adds a header to email it sends, which identifies Thunderbird and also the version number of Thunderbird and the operating system which sent it.
Fastmail does not delete this header of course - an email vendor is not
supposed to delete headers added by the email client.