hi, On 10/1/20 12:21 AM, JEAN-PAUL CHAPALAIN wrote: > I had the same problem when migrating from Dovecot V2.2.36 on, Centos-7 to > Dovecot v2.3.8 on Centos-8
My report is specifically/solely about the addition/use of the Options = ServerPreference parameter. I don't see that in your configuration. Are you using it? In a config using Dovecot's submission proxy?