exim+dovecot+sieve issue

[Stephan Bosch]

On 17/08/2019 15:37, JM via dovecot wrote:
> Hi,
>
> We have mail server in production, with Exim + Dovecot + Mailman + 
> OpenLDAP + Roundcube webmail server.
> Openldap keeps mail accounts in db, exim uses lmtp transport to 
> deliver messages to dovecot.
> Mailman is responsible for mailing lists, Roundcube webmail has 
> managsieve module to create sieve filters.
>
> Exim router,transport for dovecot
>
>     localuser:
>       driver = accept
>       domains = +local_domains : +virt_domains
>       check_local_user
>       transport = dovecot_lmtp
>       cannot_route_message = Unknown account
>       no_more
>
>
>     dovecot_lmtp:
>       driver = lmtp
>       socket = /var/spool/dovecot/lmtp
>       batch_max = 500
>       rcpt_include_affixes
>
>
> It worked perfectly, but after upgrade from Dovecot 2.2 to Dovecot 2.3 
> major version, I've found a lot of strange errors in exim panic.log
>
>     mail exim[7821]  Failed to get user name for uid 1175
>     mail exim[7880]: Failed to get user name for uid 1173
>
> etc
> where uids are ldap accounts and recognized by system (id 1175 shows 
> user's name and group)
>
> Even worse, some clients start to receive notify email with strange 
> content, when sending email to mailing lists
>
>     user at domain.com <mailto:user at domain.com>
>         Delay reason: error in redirect data: malformed address:
>     someuser1 at domain.com <mailto:someuser1 at domain.com> may not follow
>     someuser2 at domain.com <mailto:someuser2 at domain.com>  in
>     "someuser3 at domain.com <mailto:someuser3 at domain.com> ..some crap
>     here.." , where someuser addresses are not related to recipient
>     address and unknown for sender.
>
>
> After some investigation,I've found out that dovecot's sieve produces 
> these errors (I suspect sieve vacation, when user creates vacation via 
> Roundcube webmail).

Found out how? It doesn't look like a Pigeonhole or Dovecot error 
message to me.

> If set "submission_host = exim ip" in dovecot.conf, exim doesn't 
> produce errors in panic.log anymore, but clients still receive email 
> with malformed address.
> Please help me to find the root of the problem (some broken sieve 
> filter in user's maildir, misconfiguration or breaking changes in new 
> Dovecot version?)

Do  you have an example of a malformed address?

What is your exact Dovecot configuration (output from `dovecot -n`).

Regards,

Stephan.