Sender address when notifying original recipient

Hello,

I am using sieve with notification of the original recipient in the case that an email has been identified to contain a virus. After upgrading dovecot from 2.2.21 to 2.2.29.1, I now detected that in these notifications, their sender address is now , instead of postmaster@mailserver.domain, like it was before.

Is it possible to revert to the old format?

Regards Christoph