2 Apr
2022
2 Apr
'22
6:29 p.m.
On 4/2/22 3:23 PM, Jeroen Massar via NANOG wrote:
Hi Dan,
Hope the rest of the world is treating you decently!
There are a lot of bits and bobs that one has to get right for mail to flow, amongst which:
- IP -> PTR lookup -> that hostname lookup, and match to IP again (https://en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS) - SPF - DKIM - DMARC - ARC (for mailinglists)
Seriously spend zero time on ARC. It doesn't work as advertised and is basically snake oil. Mike