action based on IMAP ID fields

Michael Peddemors michael at
Fri Oct 22 22:07:04 EEST 2021

On 2021-10-21 12:26 p.m., Jörg Backschues wrote:
> Hello,
> is it possible based on the information we get from the IMAP ID fields 
> sent by a client to start some actions e.g. reject an IMAP client with a 
> certain OS version?

You might like to look at CLIENTID, it's design allows for that.  But if 
you are looking at just OS, p0f is your friend.  We use it not only to 
identify the connection in dovecot, but as a threat indicator as well.

You can reach out off list, and I can send you a few pointers..

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