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* Replace Postgrey with postscreen.Guilhem Moulin2015-06-071
| | | | | | | | | | | See http://www.postfix.org/POSTSCREEN_README.html and http://rob0.nodns4.us/postscreen.html It's infortunate that smtpd(8) cannot be chrooted any longer, which means that we have to un-chroot cleanup(8) as well. Indeed, currently smtpd(8) uses $virtual_alias_maps for recipient validation; later cleanup(8) uses it again for rewriting. So these processes need to be both chrooted, or both not.
* Perform the alias resolution and address validation solely on the MX:es.Guilhem Moulin2015-06-071
| | | | | We can therefore spare some lookups on the MDA, and use static:all instead.
* Ensure Postfix's LDAP searchBase exists when doing a lookup.Guilhem Moulin2015-06-071
| | | | | | | | Postfix interprets Error Code 32 (No Such Object) as lookup failures, but that's ugly... Also, make Postfix simple bind against cn=postfix,ou=services,dc=fripost,dc=org.
* Remove o=mailHosting from the LDAP directory suffix.Guilhem Moulin2015-06-071
| | | | | | So our suffix is now a mere 'dc=fripost,dc=org'. We're also using the default '/var/lib/ldap' as olcDbDirectory (hence we don't clear it before hand).
* Assume a DNS entry for each role.Guilhem Moulin2015-06-071
| | | | | | E.g., ldap.fripost.org, ntp.fripost.org, etc. (Ideally the DNS zone would be provisioned by ansible, too.) It's a bit unclear how to index the subdomains (mx{1,2,3}, etc), though.
* Decongestion potential bottlenecks on trivial_rewrite(8).Guilhem Moulin2015-06-071
| | | | | | | | | | | | | Which might be caused by slow LDAP lookups in transport_maps. Instead, we alias each addresses for which we want a custom transport to a dedicated "dummy" domain, and use a static (CDB) transport_maps to map said domains to their transport; the receiver can then use canonical(8) to restore the original envelope recipient. Since the alias resolution is performed by cleanup(8), which can run in parallel with other instances, it should decongestion bottlenecks under heavy loads. So far only the MX:es have been decongestioned. The list manager and the MDA should be treated as well.
* Fix the catch-all resolution again.Guilhem Moulin2015-06-071
We introduce a limitation on the domain-aliases: they can't have children (e.g., lists or users) any longer. The whole alias resolution, including catch-alls and domain aliases, is now done in 'virtual_alias_maps'. We stop the resolution by returning a dummy alias A -> A for mailboxes, before trying the catch-all maps. We're still using transport_maps for lists. If it turns out to be a bottleneck due to the high-latency coming from LDAP maps, (and the fact that there is a single qmgr(8) daemon), we could rewrite lists to a dummy subdomain and use a static transport_maps instead: virtual_alias_maps: mylist@example.org -> mylist#example.org@mlmmj.localhost.localdomain transport_maps: mlmmj.localhost.localdomain mlmmj: