What’s the difference between ISP filtering and user filtering?
ISP-level filtering happens at the mailbox provider's servers. It applies to all incoming mail based on sender reputation, authentication, content analysis, and global abuse signals. This determines initial placement.
User-level filtering applies individual preferences and learned behavior. It includes personal rules, contact lists, and engagement history. A message might pass ISP filters but still land in spam if the specific user has previously marked similar messages as junk.
ISP filtering is the first gate. User filtering is the second. Both can affect your placement.
ISP filtering is port authority screening. User filtering is the customs agent checking your specific relationship with each recipient.
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