Thank you Wietse. This is what is set relay_domains on my server:
relay_domains = proxy:mysql:/etc/postfix/mysql-relay-domains.cf /etc/postfix/mysql-relay-domains.cf: query = select domain from domain where domain='%s' and active='1' And, obliviously, while the query returns '2domain.tld' for the domain 2domain.tld, it returns nothing for domain '3domain.2domain.tld'. Neverthless, the sender of mail coming from domain @3domain.2domain.tld are cheched for existance and so refused with the message " Sender address rejected: User unknown in relay recipient table". Could you please say how to edit parent_domain_matches_subdomains to avoid that relay_domains matches also subdomain of domain 2domain.itld? Maybe I have to set parent_domain_matches_subdomains from default: parent_domain_matches_subdomains = debug_peer_list,fast_flush_domains,mynetworks,permit_mx_backup_networks,qmqpd_authorized_clients,relay_domains,smtpd_access_maps to parent_domain_matches_subdomains = debug_peer_list,fast_flush_domains,mynetworks,permit_mx_backup_networks,qmqpd_authorized_clients,smtpd_access_maps ? Could you please submit an example with regexp or pcre table for relay_domains gets rid of this automatic subdomain matching behavior? Regards, RS -----Messaggio originale----- Da: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] Per conto di Wietse Venema Inviato: mercoledì 27 luglio 2022 12:41 A: Postfix users <postfix-users@postfix.org> Oggetto: Re: third-level domains ATTENZIONE: Questa email ha origine esterna all’organizzazione. Non selezionare link o scaricare allegati, a meno di riconoscere il mittente e di sapere che il contenuto è sicuro. Scappatura Rocco: > Hello. > > I'm stuck while observe my server postfix, that hosts domain 2domain.tld, > that refuses mail from sender of the domain 3domain.2domain.tld (not hosted > on my server): > > Jul 11 14:43:36 myserver postfix/smtpd[1799310]: NOQUEUE: reject: RCPT > from smtpecsmallgo02.extdomain.tld [xx.xx.xx.xx]: 550 5.1.0 > <n...@3domain.2domain.tld>: Sender address rejected: User unknown in > relay recipient table; from=<n...@3domain.2domain.tld> > to=<n...@2domain.it> proto=ESMTP helo=<smtps.extdomain.tld> > > Basically, myserver check the validity of sender in the domain > 3domain.2domain.tld even if it is not local (while it is local domain > 2domain.tld). > > In can't find where is the miscunfiguration in postfix.. relay_domains matches all subdomains of the listed domains. This is controlled with parent_domain_matches_subdomains. Unfortunately the default value is a long list, so edit this carefully. Perhaps using a regexp or pcre table for relay_domains gets rid of this automatic subdimain matching behavior. Wietse
