Quote:
Originally Posted by DNSB
I could suggest a couple of items to check. Do you have the reverse DNS lookup for your sending address set up correctly (DNS PTR records)? Have you added a spf text record to your domain? Do you have an AAAA as well as an A record for your sending address? The last is kinda stupid but one site I deal with requires that record before allowing my emails to hit their servers. All this is much easier if you control your own DNS server(s) as few ISPs are willing to go to the trouble of setting up those records for a home user or even a small business user. You can also try plugging your sending IP address into MXToolbox or similar site to see what your reputation, if any, is.
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I have rDNS, but not SPF because it is more or less useless, and would actually reduce the likelihood of my other mail getting through because valid SPF is a positive spam sign (seriously: it is more used by spammers than by nonspammers: it took active manual overriding to prevent SpamAssassin's GA trainer from giving it a high positive score in the last training run).
I'm not even trying to send or receive email over IPv6 (yet).