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SMTP Mail Servers using DDNS - Mail Reputation Issues?
TalkTalk Business managed to lose my /29 RIPE allocation, so I had to move my mail servers on to DDNS in rather a hurry. Actually the process was pretty painless and everything went rather well, however now I'm finding that mail is being rejected by external mail filtering services.
I've been careful to keep the dyn host name in the MX record, so a reverse DNS lookup works. I'm wondering is Mail Handling Services don't like the host resolving to a dyn CNAME as apposed to static address?
I'm interested to know how other people have implemented DDNS for SMTP Relay and avoided having mail rejected (550).