doveadm sending invalid AUTHENTICATE to uw-imap

Aki Tuomi aki.tuomi at
Wed Feb 8 07:52:27 UTC 2023

Can you try setting imapc_sasl_mechanisms to login, maybe it works better?


> On 08/02/2023 06:24 EET Chris Candreva <chris at> wrote:
> I'm migrating a legacy uw-imap system to Dovecot, on a Rocky (RHEL) 8 
> server running Dovecot 2.3.16-3 from their repos. I am using a master user 
> to import all users for an imaps connection from the old server to the 
> new. On a trial run however, it worked for about half the users. Half are 
> giving an error of the form:
> dsync(user): Error: imapc(host:993): 
> Command '1 AUTHENTICATE PLAIN xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' failed with BAD: 
> 1 Missing or invalid argument to AUTHENTICATE
> I can't seem to get the IMAP command for the users that did work. However, 
> on the face of it, that is an invalid AUTHENTICATE command. If I take that 
> string and brake it up into (what I've googled is) the proper form of 
> multi-command form of
> +
> xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> then the login succeeds. I have not been able to find anyone else with 
> this problem in my search. Is this a known issue, is there a way to force 
> the multi-line AUTHENTICATE, something else I'm missing ? Any help is 
> appreciate on this!
> -Chris
> -- 
> ---
> ========================================================================
> Chris Candreva  --  chris at  --

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