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Martin Gautier wrote: > Thanks for the pointers > > Hmm. OK makes sense, sorry - it's mailhost.zen.co.uk > dig (from the actual server in question) gives: > > ; <<>> DiG 9.3.2 <<>> mailhost.zen.co.uk > ;; global options: printcmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7013 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2 > > ;; QUESTION SECTION: > ;mailhost.zen.co.uk. IN A > > ;; ANSWER SECTION: > mailhost.zen.co.uk. 636 IN A 212.23.3.98 The error was that no "MX" record exists for the address. Not a query for an A record. 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. Simon -- 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