The volume of spam is mind boggling. When we first implemented DMARC / DKIM etc our legit emails were 3% or so of all outbound mail per the reporting we got back! We have a somewhat trusted domain.
Some mail delivery systems start to notice that your domain name is being used as part of a lot of spam / bogus emails, so you can have perfect IP history / no spam and STILL start triggering some random filters (no big players but smaller protection product filters).
So the game must be absolutely never ending for everyone and the inbox a valuable target - especially now that unsolicited phone calls really do seem to get ignored these days - I feel like spammers killed the golden goose on phone calls and the telcos let them.
I will say DKIM / DMARC is working well, except google (which we now use for outbound) gives us transient SPF errors even though we are 100% using their IPs. Not sure why that is (ie, SPF failure on an IP that should clear)
Some mail delivery systems start to notice that your domain name is being used as part of a lot of spam / bogus emails, so you can have perfect IP history / no spam and STILL start triggering some random filters (no big players but smaller protection product filters).
So the game must be absolutely never ending for everyone and the inbox a valuable target - especially now that unsolicited phone calls really do seem to get ignored these days - I feel like spammers killed the golden goose on phone calls and the telcos let them.
I will say DKIM / DMARC is working well, except google (which we now use for outbound) gives us transient SPF errors even though we are 100% using their IPs. Not sure why that is (ie, SPF failure on an IP that should clear)