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> Ports 25, 443, 993 are needed in order to have a fully functional Own-Mailbox. Even if you flout your ISP's server policy, there's still DHCP to contend with
by isomorphic 11y ago
> Ports 25, 443, 993 are needed in order to have a fully functional Own-Mailbox.
Even if you flout your ISP's server policy, there's still DHCP to contend with (changing IPs).
- pilif 11y agodynamic DNS exists. There's no reason why the host behind a MX entry can't be a dynamically updated address. MX records are names, not addresses.
- devicenull 11y agoReverse DNS is a pretty big issue. You're not going to actually deliver any email without valid reverse DNS.
- timboslice 11y agoFrom my initial read, seems like SMTP relay is the way to go with a device like this
- Torgo 11y agoI was under the impression that you just had to have an IP with an A record that matched the reverse DNS, even if it's not for the A record that's your email domain?
- jlgaddis 11y agoIt depends on the MX you're delivering mail to. Some aren't restrictive at all, some will reject if there's an A/PTR mismatch, etc. I make use of FCrDNS on my mail systems.
- scintill76 11y agoWhat is "valid"? I've been delivering personal email for 2 years from an IP whose reverse is like 1-2-3-4-static.hfc.comcastbusiness.net, and that name does not match what I put in my MX or HELO. Now, granted, there are probably some systems that have issues with this, and maybe I do have failed deliveries I didn't notice, but you did say no email will deliver at all.