Gmail does not publicly disclose their email filtering policies, but a key feature used by almost all email filtering systems is sender reputation. Sender reputation attempts to place a score on how likely email originating from your server is going to be spam.
All of these factors go into determining your sender score
- Email Volume
- Complaint Rates
- Spam Trap Hits
- Changes in Email Volume
- History of IP Address
- Bounce rates
- Email Sent to Unknown Users
- Total Email Volume
- IP Neighborhood
Requesting Blacklist Removal
How to keep from blacklisting again ?
If you do not fix below issues, your chances of getting removed from Gmail or any other blacklist is minimal.
- Stop the spamming!
- Reverse DNS Must Resolve to a Valid Hostname
- Your Server’s Hostname Must Have a DNS ‘A’ Record
- Do not blindly forward email to Gmail
- Make Sure DKIM/SPF are correct
Check your Sender Score and learn more about email filtering.
To check black list
