On 24/09/2020 13:43, Jim Jackson wrote: > Mostly. Somemail servers do a reverse IP lookup and see if it matches your > envelope From domain.
Yes, this is an annoyance. There are two ways round this: (1) Change your server's SMTP From domain to be the same as your static IP's PTR hostname, and (2) ask your ISP to change the reverse DNS to be the name of your mail server. Option 1 is a bit embarrassing if anyone notices (e.g. "host-46462.static.bugtown.myisp.net" isn't too cool as the name of your mail server) but I don't see any technical downside, although DMARC might perhaps be an issue nowadays. I can confirm that I done option 2 in the past to good effect (on Eclipse Internet in case anyone cares) but I've not tried to do it more recently. I suspect that some ISPs might be a bit choosy about this nowadays just in case you're a spammer. -- Mark Rousell
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