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Hello Ken!
I don't think its Thunderbird adding the dot, since K9 mail on my Android phone shows the same issue. It's only after the IMAP delivery that the extra dot appears.
I've seen similar behavior with some buggy versions of amavis in ancient times (like more than 5 years ago). I wouldn't suspect dovecot to do anything like that.
With kind regards, Michael -----BEGIN PGP SIGNATURE----- Version: GnuPG v2
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