Yahoo has some of the strictest authentication requirements of the major providers. When your email lands in the Yahoo spam folder, it is usually one of a small number of fixable causes. This is the order to work through them.
Yahoo requires SPF, DKIM, and DMARC before it will deliver to the inbox. If any of the three is missing or wrong, Yahoo routes the mail to spam. The DMARC checker runs all three in one pass and tells you which record is the problem. For the exact records, the SPF, DKIM and DMARC guide covers each one.
Yahoo maintains its own reputation signals and also consults the major blocklists. The IP blacklist checker tests the sending IP against nine major lists. If you are listed, the Spamhaus delisting guide covers the request. The key point: delisting only works if the underlying cause is fixed first.
Yahoo is especially sensitive to a new domain suddenly sending at volume. If you are doing cold outreach, a fresh domain needs a reputation built before it can send to Yahoo at volume. Warm up the sending domain before scaling, and keep volume gradual.
Yahoo also weighs content signals: a high bounce rate, missing unsubscribe, and content that does not match the sending domain all push mail toward spam. Validate your list before sending and include a working unsubscribe.
The free deliverability checker runs all of these signals at once and points at the first thing to fix.
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