From the man page man 5 postconf
transport_maps (default: empty) Optional lookup tables with mappings from recipient address to (message delivery transport, next-hop destination). See transport(5) for details. Specify zero or more "type:table" lookup tables. If you use this feature with local files, run "postmap /etc/postfix/transport" after making a change. This proxy:mysql:/etc/postfix/mysql_transport.cf looks like type:type:table not type:table Did your postfix server work and suddenly stop and you have made no changes ? If so then I cannot help you. And you need more expert advice. -ANGELO FAZZINA ang...@uconn.edu University of Connecticut, ITS, SSG, Server Systems 860-486-9075 -----Original Message----- From: Rafael Azevedo <raf...@gmail.com> Sent: Thursday, March 21, 2019 10:34 AM To: Fazzina, Angelo <angelo.fazz...@uconn.edu> Cc: Postfix users <postfix-users@postfix.org> Subject: Re: Release from HOLD Hi Angelo, thanks for your reply! transport_maps = proxy:mysql:/etc/postfix/mysql_transport.cf virtual_transport = virtual BR, Rafael Em qui, 21 de mar de 2019 às 10:53, Fazzina, Angelo <angelo.fazz...@uconn.edu> escreveu: > > Hi, you may get more help by providing helpful info like > > > # postconf -n | grep -i transport > > > > -ANGELO FAZZINA > > ang...@uconn.edu > University of Connecticut, ITS, SSG, Server Systems > 860-486-9075 > > -----Original Message----- > From: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> On > Behalf Of Rafael Azevedo > Sent: Thursday, March 21, 2019 8:19 AM > To: Postfix users <postfix-users@postfix.org> > Subject: Release from HOLD > > Hi guys, > > I had a failure in one of our postfix routines that sent all messages to HOLD. > > Now, I'm trying to release from HOLD using 'postsuper -H ALL'. > > The thing is that all messages are being deferred (mail transport > unavailable). > > So, is there a way to check current message transport and maybe move > to another one? > > Thanks a lot. > > BR, > > Rafael