The Deliverability Ledger · Reputation · 1 post
Sender reputation, rebuilt
The usual reasons a sender reputation drops, and how to rebuild it.
Other topics
- DeliverabilityThe signals inbox providers weigh, what each SMTP code and bounce type means, list hygiene, warm-up, and the numbers to measure yourself against.
- MicrosoftThe 550 and 421 errors Microsoft returns, how Exchange Online Protection scores a message, SNDS and JMRP, and how to get off the Outlook blocklist.
- GoogleThe Gmail bounces senders hit most (421 4.7.0, 421 4.7.28, 550 5.7.26), the bulk sender requirements, Postmaster Tools, and the way back out of the spam folder.
- BlacklistsHow to tell if you are listed, why IP and domain blacklists catch different things, and what SURBL listings mean for cold email.
- AuthenticationSetting up SPF, DKIM and DMARC step by step, and choosing between a quarantine and a reject policy.
- YahooThe two refusals Yahoo and AOL send most, 421 [TSS04] for complaints and 554 5.7.9 for policy, and how to clear each.
- Cold EmailGetting cold outreach into the inbox without burning the domain it is sent from.
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example.comWatching
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