I want to replace old Sendmail server with new with Postfix. And although I have read some documentation and howtos, I'm still disoriented in the vast array of possibilities in Postfix itself and its interaction with other pieces. Here is what I have:
- mailserver will be the target for two domains (old surviving and current new) - users, their aliases and mail groups are in remote LDAP DB with schema /objects/values as: USERS: dn: cn=username, ou=rank, o=myorg cn: username objectClass: Person gidNumber: uNNN uidNumber: gNNN userPassword: (somehow hashed, only bind verification) homeDirectory: /Home/$rank/$username mailActive: 0/1 mail: user1@NewDomain mail: user2@OldDomain (not all users have old address] uid: username groupMembership: group DN (can be multiple times for different groups) For users in objectClass = Person applies: - cn == uid, but user1, user2 and username are not necessarily the same - users have uidNumber and gidNumber, but are almost unusable, because start from 100 (thus overlapping with system accounts ID) - homeDirectory has no meaning for mailserver machine itself - there will be only an administrator account. - absent or zero mailActive item cause mail rejecting Users can have a mail alias with LDAP in form: ---------------------------------------------- dn: cn=alias, ou=Alias, o=myorg objectClass: aliasObject cn: alias aliasedObjectName: user object DN and finally there can be mail groups defined as: ------------------------------------------------ dn: cn=groupname, ou=Groups, o=myorg cn: groupname mailActive: 0/1 (meaning same as for users) objectClass: groupOfNames member: user DN .... And my idea is: - postfix MTA (v3.2.4) with some milters (milters not essential) - dovecot (v2.3.0) IMAP server and LMTP deliver (with Sieve) - postfix, dovecot, user's mail folders on one machine (Centos 7 Linux) What will be the most appropriate layout for this scenario? I have a number of unclear areas what is best: - local users or virtual users? (I think best will be when all mail directory tree will be owned by one user account (vmail in lot howtos), but it's really best?) - mail folders should be in form '/someTopDir/$username/.mail/' ? (because isn't possible have domain part, as the user can have two mail addresses in different domains) - which transport to choose (whether one from something as local_transport = lmtp:unix:/var/run/dovecot/dovecot-lmtp virtual_transport = lmtp:unix:/var/run/dovecot/dovecot-lmtp mailbox_transport = lmtp:unix:/var/run/dovecot/dovecot-lmtp or something else? - which maps are needed and how to define them? - eventually how to configure dovecot LMTP deliver? Any recommendations or instructions are highly appreciated. Thanks, Franta
