Dovecot failed to restart after deletion of subdomain

After deletion of a subdomain the dovecot server is no longer able to start (crashes immediately after booting).

I did some research and found the reason:

In the file /etc/dovecot/dovecot.conf there is a SSL-entry for every subdomain - even if mailing is disabled for the subdomain! The entry is in this form:

local_name sub.domain.de { ssl_cert = </home/domain/domains/sub.domain.de/ssl.cert ssl_key = </home/domain/domains/sub.domain.de/ssl.key }

The refering cert and key files are removed while deleting the subdomain, but the entry in this file still exists. Dovecot can not start with this config!

Solution: * such entrys are not useful for subdomains without mailing * such entrys should be removed while deleting the domain.

Maybe it matters: I first deactivated the subdomain and deleted it later. This is my standard workflow for doing this. I was not able to test it with direct deletion because I have only one productive system at moment.