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Chris/Simon Thanks. I put the brackets in, restarted postfix and not had any complaints all week. Sounds like it might be sorted. Martin Chris Smith wrote: > Simon Waters wrote: > >> My guess is that you have the smart host config wrong in Postfix. >> >> Probably "relayhost=mailhost.zen.co.uk" when it should be >> "relayhost=[mailhost.zen.co.uk]" although why only sometimes I'm not >> sure. For that we'd need the output of "postconf -n" and probably better >> asked on the Postfix users list, if the above doesn't answer the question. >> > > The brackets tell Postfix not to do an MX lookup on the record. If you > want to connect to the specified host wrap it in brackets otherwise > Postfix will connect to an MX server for the domain you specify. In this > case you want the brackets. :) > > Chris -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html