On Thu, 2020-09-24 at 17:32 +0100, Mark Rousell wrote: > 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. > > >
Jim. It's not an annoyance. I think it's good practice.I also end up rejecting a lot of spam because it lacks a reverse hostname (it's easily the largest category).So it's not just a few such as ntlworld and gmx that check this. Option 2 works for me too. I'm with Zen Internet in the UK. -- Marjorie
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