I'd say that clicking 'mark as not spam' simply moves the message from
the Spam folder into your Inbox. I doubt there's any magic behind it.

What you could check in addition is the mail header.
Save a copy of the spam mail while it's marked as spam, then mark it as
not spam and save another copy and 'diff' it with the first one.
If indeed the X-SPAM headers were removed in the second one, then my
first statement is wrong.

Regards,
Mathias
On Tue, Sep 01, 2026 at 03:54:54PM -0500, Greg Marks wrote:
> This is perhaps not a question directly about Mutt, but members of this
> list might have useful insights to offer.
> 
> Mutt is preferable to any Web browser for accessing G-Mail, and this
> is particularly true for inspecting the Spam folder, since in Mutt
> it is much more difficult to unintentionally click on a dangerous
> hyperlink or open a malicious attachment, and various exploits that
> might be inserted into an e-mail message won't work in a text-based
> e-mail client like Mutt.  (If I'm not mistaken, trackers, for example,
> will not work in an e-mail message opened in Mutt.)
> 
> The only problem concerns false positives in the Spam folder.
> In the G-Mail Web interface, one can click on a button indicating
> that a particular message is not spam, and presumably this feeds
> into some machine-learning process making it less likely that similar
> messages will be caught in the G-Mail spam filter.  Does anyone know
> if there is a way of doing this via IMAP connection through Mutt?
> It is certainly possible to connect with Mutt, go to the Spam folder,
> and save a message that is not actual spam to the Inbox folder; however,
> I don't know if moving the e-mail out of the Spam folder in this way has
> the same effect as clicking the "Not Spam" button in the Web interface.
> 
> Does anyone have any idea about this?
> 
> Best regards,
> Greg Marks



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