Are all ISPs equally strict on placement rules?
Myth: Email providers all use the same filtering approach.
Reality: Each provider has unique filtering priorities and methods.
Gmail: Heavy engagement weighting, sophisticated ML.
Microsoft: Strong IP reputation focus, SmartScreen filtering.
Yahoo: Complaint-driven, FBL emphasis.
Others: Varying approaches, often more blocklist-dependent.
Success at one provider does not guarantee success at others. Monitor and optimize per-provider.
Each harbor has its own inspection criteria. Learn what each one prioritizes.
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