extra_fields="${extra_fields:+$extra_fields }userdb_uid=$uid"
extra_fields="${extra_fields:+$extra_fields }userdb_gid=$gid"
extra_fields="${extra_fields:+$extra_fields }userdb_home=$home"
- extra_fields="${extra_fields:+$extra_fields }userdb_mail_access_groups=${mail_access_groups-$domain_group}"
+ extra_fields="${extra_fields:+$extra_fields }userdb_mail_access_groups=${mail_access_groups-$domain_group,amavis}"
cat >&3 <<-EOF
$user:$password:$uid:$gid:$gecos:$home:$shell:$extra_fields
EOF