Filtered rate means the message was accepted at the gateway but then bulked or was dropped due to reputation drivers such as end user complaints, spam trap hits and unknown user rates. Applying best practice recommendations listed for those drivers will help decrease the filtered rate. Content and authentication may play a role as well. Inbox Monitor would report this as bulked or missing.
There is no single fix for problems with a high filtered rate. All of the following areas can cause higher filtered rates:
- Investigate if certain content and URLs are generating an abnormal amount of end user complaints and are frequently bulked. These are indications that it may be time to update and test content and URLs to determine if deliverability has improved.
- If you send third party content, investigate if certain content (especially URLs/domains) are generating an abnormal amount of end user complaints and are frequently bulked. These are indications that the third party should update the content or the content should not be used.
- Check to make sure your SPF record is valid, up to date, and refers to the sending IP.
- Check to make sure your DKIM is functioning correctly.
- Refer to fix button on complaint rate
- Refer to fix button on spam trap
- Refer to fix button on Unknown User