On 6/1/2020 10:55 AM, Alexander Dalloz wrote: > > Whatever backend you configure cyrus-sasl to use for validating the > SMTP AUTH credentials, it is possible to use other values than a user > name. I'm no sasl expert but it looks like one could store the weird username in /etc/sasldb: https://www.cyrusimap.org/sasl/sasl/sysadmin.html One could also hack up an extra PAM module for use by saslauthd.