Comment 2 for bug 41745

this is exactly what i expect the package manager to do for me (or at least present me an option to choose if it should be done or not).

I had to add the line you mentionto the main.cf. additionally i had to add the following to the master.cf

smtp-amavis unix - - y - 2 lmtp
 -o smtp_data_done_timeout=1200
 -o disable_dns_lookups=yes
127.0.0.1:10025 inet n - y - - smtpd
 -o content_filter=
 -o local_recipient_maps=
 -o smtpd_client_restrictions=
 -o smtpd_helo_restrictions=
 -o smtpd_sender_restrictions=
 -o smtpd_recipient_restrictions=permit_mynetworks,reject
 -o mynetworks=127.0.0.0/8