Getting mail accepted.
WHAT DETERMINES WHETHER MAIL ARRIVES
The sending address's reputation The sending domain's reputation Authentication passing Content Recipient engagement
WHAT DAMAGES REPUTATION
Sending to invalid addresses Complaints Sending unexpected mail Sudden volume increases Compromised accounts sending in volume
WHAT TO DO ABOUT INVALID ADDRESSES
Remove them immediately on permanent failure.
WHY
Continuing to send to them is a strong negative signal.
WHAT WARMING UP MEANS
Increasing volume gradually from a new address, building reputation.
WHY IT IS NECESSARY
Sudden volume from an unknown address is treated as suspicious.
WHAT TO SEPARATE
Transactional mail from marketing, onto different addresses or subdomains.
WHY
So marketing complaints do not affect delivery of password resets.
WHAT TO CONFIGURE
Reverse name resolution matching the sending name Authentication records Feedback loops, where available
WHAT TO MONITOR
Bounce rates, complaint rates, and whether you appear on blocklists.
WHAT TO DO ON LISTING
Establish the cause, fix it, then request removal.
