Further investigation showed that the server seemed to be in a perpetual state of CONTACTING BLACKLIST (shown in CommuniGator SMTP Monitor).
today I've had a look and it seems that my first DNS entry isn't resolving addresses, but the second (or alternative) does.
Would this hold up contacting the blacklists servers? surely they would eventually give up on the first DNS server and move to the second for resolution?
I've got the following RBLs listed:
blackholes.easynet.nl brazil.blackholes.us cbl.abuseat.org cn-kr.blackholes.us korea.services.net malaysia.blackholes.us nigeria.blackholes.us opm.blitzed.org sbl.spamhaus.org singapore.blackholes.us
...as a temporary fix I've turned off USE BLACKLIST DNS and Verify Return paths
puzzled
TIA
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