Hello,
Please help in case you encountered something similar
So mails are recieved and delivered very quickly to aproximately all domain gmail, yahoo, and very quickly, etc
I adjusting DMARC, SPF, I use mxtoolbox to troubleshout
so I dont have errors right now just 4 warnings:
Reverse DNS does not match SMTP Banner
Warning - Does not support TLS.
SMTP transation time 8.297 seconds - Not good! on Transaction Time
and Name Servers are on the Same Subnet
when I want to sent mail to the domain that is uses office 365, canot get to it send me #550 4.4.7 QUEUE.Expired; message expired ## what it can be?
Thnaks