Hey Peter: Your mailserver appears to be a bit aggressive and is blocking mail from people on the list who are replying to you:
<em...@ace.net.au>: host acemail1.ace.net.au[150.101.236.36] said: 553 5.3.0
Rejected 71.19.148.97 by clients-b.blocked.rbl (in reply to MAIL FROM
command)
multirbl.valli.org shows no issues, and I'm even in DNSWL_MED.
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