On Tue, Mar 29, 2016 at 10:55:31AM -0500, /dev/rob0 wrote: > > If it's not a bug, additional explanation in the documentation as > > to its behavior would be useful. > > I agree. I had the same question some years ago, until it was > explained to me. > > The only documentation I know of is > postconf.5.html#parent_domain_matches_subdomains and > postconf.5.html#relay_domains : > > relay_domains (default: $mydestination) > > What destination domains (and subdomains thereof) this system > will relay mail to. Subdomain matching is controlled with the > parent_domain_matches_subdomains parameter.
There are a few features for which the semantics of p_d_m_s are explained in more detail, for example: http://www.postfix.org/access.5.html EMAIL ADDRESS PATTERNS With lookups from indexed files such as DB or DBM, or from networked tables such as NIS, LDAP or SQL, patterns are tried in the order as listed below: user@domain Matches the specified mail address. domain.tld Matches domain.tld as the domain part of an email address. The pattern domain.tld also matches subdomains, but only when the string smtpd_access_maps is listed in the Postfix par- ent_domain_matches_subdomains configuration setting. .domain.tld Matches subdomains of domain.tld, but only when the string smtpd_access_maps is not listed in the Postfix par- ent_domain_matches_subdomains configuration setting. http://www.postfix.org/transport.5.html TABLE SEARCH ORDER With lookups from indexed files such as DB or DBM, or from networked tables such as NIS, LDAP or SQL, patterns are tried in the order as listed below: user+extension@domain transport:nexthop Deliver mail for user+extension@domain through transport to nex- thop. user@domain transport:nexthop Deliver mail for user@domain through transport to nexthop. domain transport:nexthop Deliver mail for domain through transport to nexthop. .domain transport:nexthop Deliver mail for any subdomain of domain through transport to nexthop. This applies only when the string transport_maps is not listed in the parent_domain_matches_subdomains configuration setting. Otherwise, a domain name matches itself and its subdo- mains. Unfortunately, not all lookup mechanisms have a separate manpage with this level of detail. The rest is inferred from economy of mechanism. Every table in which parent domain matching is supported behaves like access(5) and transport(5) with respect to leading dot. -- Viktor.
