Listing 3. Lines to Add to /etc/postfix/master.cf

smtp-amavis unix -     -      y      -      2  smtp
     -o smtp_data_done_timeout=1200
     -o disable_dns_lookups=yes

127.0.0.1:10025 inet n  -      n      -     -  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_unauth_destination
     -o mynetworks=127.0.0.0/8
     -o strict_rfc821_envelopes=yes
     -o smtpd_error_sleep_time=0
     -o smtpd_soft_error_limit=1001
     -o smtpd_hard_error_limit=1000