Re: relay_domains parameter for a hosted domain
Well I'm new in the company (and new to Postfix) and the system was already set, so I'm trying to understand how is this configured. I'm seeing a warning regarding this in the logfile that tells me that the domain name must not be listed in both virtual_mailbox_domains and relay_domains, so obviously you were right :). I don't know why $virtual_mailbox_maps is listed in virtual_mailbox_domains. I've read that $virtual_mailbox_maps is the default value for virtual_mailbox_domains, so I think that the previous guy thought that if he set virtual_mailbox_domains just to hash:/etc/postfix/vmaildomains it would overwrite the default value and the virtual_mailbox_maps lookup table wouldn't be in use. However, I'm not sure why having virtual_mailbox_domains set is necessary, since the virtual(8) delivery agent will use the virtual_mailbox_maps lookup table anyway (if this have been set) to verify that the recipient address is valid. Am I right? On Wed, Aug 5, 2009 at 9:28 AM, Magnus Bäckmag...@dsek.lth.se wrote: On Wednesday, August 05, 2009 at 10:25 CEST, Yeray Gutiérrez Cedrés yera...@gmail.com wrote: I have this in my main.cf file: relay_domains = example.com virtual_mailbox_domains=$virtual_mailbox_maps hash:/etc/postfix/vmaildomains Why are you listing $virtual_mailbox_maps here? virtual_mailbox_maps = ldap:ldapvirtualmap virtual_mailbox_base = /var/vmail/ virtual_transport = maildrop And this is the content of /etc/postfix/vmaildomains: # more /etc/postfix/vmaildomains example.com required Is it necessary to have this domain in relay_domains or does this work without it being there? On the contrary -- a domain listed in virtual_mailbox_domains MUST NOT be listed in relay_domains. -- Magnus Bäck mag...@dsek.lth.se
Re: relay_domains parameter for a hosted domain
On Wednesday, August 05, 2009 at 10:48 CEST, Yeray Gutiérrez Cedrés yera...@gmail.com wrote: I don't know why $virtual_mailbox_maps is listed in virtual_mailbox_domains. I've read that $virtual_mailbox_maps is the default value for virtual_mailbox_domains, so I think that the previous guy thought that if he set virtual_mailbox_domains just to hash:/etc/postfix/vmaildomains it would overwrite the default value and the virtual_mailbox_maps lookup table wouldn't be in use. However, I'm not sure why having virtual_mailbox_domains set is necessary, since the virtual(8) delivery agent will use the virtual_mailbox_maps lookup table anyway (if this have been set) to verify that the recipient address is valid. Am I right? Yes, but Postfix must know which domains are virtual mailbox domains, i.e. which domains should be passed off to virtual(8). It's not necessarily wrong to list $virtual_mailbox_maps in virtual_mailbox_domains (it's there by default for backwards compatibility reasons), but unless you actually list the virtual mailbox domains in lookup tables specified in $virtual_mailbox_maps there is no point in listing $v_m_m in v_m_d. Bottom line -- if all virtual mailbox domains are listed in the vmaildomains file you can remove $v_m_m from v_m_d to simply your configuration, avoid confusion, and relieve your LDAP server from unnecessary lookups. The latter is good since qmgr(8) runs in a single thread and is severely affected by high-latency lookups. It's therefore highly preferable to have mydestination and the xxx_domains parameters list simple lookup tables like hash, btree, cdb, pcre etc that always have a quick response time. Please do not top-post. -- Magnus Bäck mag...@dsek.lth.se
Re: relay_domains parameter for a hosted domain
On Wed, Aug 5, 2009 at 10:18 AM, Magnus Bäckmag...@dsek.lth.se wrote: On Wednesday, August 05, 2009 at 10:48 CEST, Yeray Gutiérrez Cedrés yera...@gmail.com wrote: I don't know why $virtual_mailbox_maps is listed in virtual_mailbox_domains. I've read that $virtual_mailbox_maps is the default value for virtual_mailbox_domains, so I think that the previous guy thought that if he set virtual_mailbox_domains just to hash:/etc/postfix/vmaildomains it would overwrite the default value and the virtual_mailbox_maps lookup table wouldn't be in use. However, I'm not sure why having virtual_mailbox_domains set is necessary, since the virtual(8) delivery agent will use the virtual_mailbox_maps lookup table anyway (if this have been set) to verify that the recipient address is valid. Am I right? Yes, but Postfix must know which domains are virtual mailbox domains, i.e. which domains should be passed off to virtual(8). It's not necessarily wrong to list $virtual_mailbox_maps in virtual_mailbox_domains (it's there by default for backwards compatibility reasons), but unless you actually list the virtual mailbox domains in lookup tables specified in $virtual_mailbox_maps there is no point in listing $v_m_m in v_m_d. So qmgr(8) checks that the domain is a virtual mailbox domain (performing a lookup in a hash listed in virtual_mailbox_domains) before passing it off to virtual(8). Then, the mail delivery agent virtual(8) performs a lookup in the LDAP server (listed in virtual_mailbox_maps). Is my reasoning right? If it's right and virtual_mailbox_domain is not set, so its default value is virtual_mailbox_maps (wich lists an LDAP database), Postfix would perform twice the same LDAP lookup (one time in qmgr(8) and another time in virtual(8)). I suppose that I'm wrong with that, but I can't see how does this behave. If I were right, that would mean that's much better to list virtual domains in virtual_mailbox_domains with a simple hash than just leaving it to its default value. Bottom line -- if all virtual mailbox domains are listed in the vmaildomains file you can remove $v_m_m from v_m_d to simply your configuration, avoid confusion, and relieve your LDAP server from unnecessary lookups. The latter is good since qmgr(8) runs in a single thread and is severely affected by high-latency lookups. It's therefore highly preferable to have mydestination and the xxx_domains parameters list simple lookup tables like hash, btree, cdb, pcre etc that always have a quick response time. Please do not top-post. Sorry for that. -- Magnus Bäck mag...@dsek.lth.se
Re: relay_domains parameter for a hosted domain
On Wednesday 05 August 2009 05:37:12 Yeray Gutiérrez Cedrés wrote: If it's right and virtual_mailbox_domain is not set, so its default value is virtual_mailbox_maps (wich lists an LDAP database), Postfix would perform twice the same LDAP lookup (one time in qmgr(8) and another time in virtual(8)). Minor nitpick: that is not the same lookup. The _maps lookup is for u...@example.com, the domain lookup is merely example.com. I suppose that I'm wrong with that, but I can't see how does this behave. If I were right, that would mean that's much better to list virtual domains in virtual_mailbox_domains with a simple hash than just leaving it to its default value. Indeed, the domain class definitions (virtual_*_domains, relay_domains and mydestination, see ADDRESS_CLASS_README) are very important; in general not something I would want to trust to an external daemon. If they change so frequently as to benefit from being maintained in an external database, your site is so large that you should have some redundancy for both the database and the MTA. Note that there's no reason why virtual_mailbox_maps cannot also be a hash: lookup. -- Offlist mail to this address is discarded unless /dev/rob0 or not-spam is in Subject: header
