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I use a relay server to deliver external mails. I use relay server's IP in SPF record. But I'm not sure about blacklist monitoring/checking. Should I check main server's IP or relay's IP?

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Unless I misunderstand your design, your relay server will be the one making a direct connection to remote mail servers. Therefore whichever public ip your relay uses should be the one seen (and checked and possibly reported) by the remote server(s).

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  • @dyassny: rats, beaten by 2 mins :-)
    – ErikE
    Jan 1, 2014 at 20:12
  • easy pickings ;)
    – dyasny
    Jan 1, 2014 at 20:22
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You should monitor the relay's IP - if this is the MTA doing the actual delivery, then delivery will fail if it gets into RBL/PBL

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