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If I set the domain in resolv.conf to one domain (say test1.co.uk), I can send emails through my mail relay.

If I change the domain to a different domain (say test2.co.uk), then sendmail fails. I can send emails through telnet manually though.

Any ideas?

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You have to at least provide us with the failure logs –  adamo Aug 22 '12 at 10:16
    
total novice...sorry. Where would the logs be? –  neildeadman Aug 22 '12 at 10:34
    
/var/log/maillog, /var/adm/maillog or the like. –  adamo Aug 22 '12 at 13:04

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