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Topic · 364 guides · 10 subjects

Email Deliverability

Sender reputation, warm-up, list hygiene, and inbox placement.

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Email header analyser

Read authentication, DMARC alignment, and hop-by-hop delays from raw headers.

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Technical analysis

Warm-up schedule planner

Build a day-by-day ramp that respects per-mailbox ceilings.

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Sender reputation

Sender reputation is the score mailbox providers assign to a sending domain and IP based on complaint rates, bounce rates, engagement, spam-trap hits, and authentication history. It determines whether mail is delivered, filtered, or rejected.

26 more for specific providers, platforms, industries, and regions

Domain and IP warm-up

Warm-up is the practice of gradually increasing sending volume from a new domain or IP so mailbox providers can build a positive reputation profile before you reach full volume.

26 more for specific providers, platforms, industries, and regions

List hygiene

List hygiene is the ongoing removal of invalid, inactive, and risky addresses from a mailing list, plus verification of new addresses at the point of capture.

26 more for specific providers, platforms, industries, and regions

Inbox placement testing

Inbox placement is the percentage of sent mail that lands in the primary inbox rather than spam, promotions, or being blocked. It is measured with seed lists across major providers and panel data from real mailboxes.

26 more for specific providers, platforms, industries, and regions

Blocklists and delisting

Blocklists (Spamhaus, SpamCop, Barracuda, and others) publish IPs and domains observed sending spam. Receivers query them at connection time to reject or filter mail.

26 more for specific providers, platforms, industries, and regions

Bounce handling

Bounce handling is the automated processing of delivery failure notices (DSNs) to classify hard versus soft bounces and suppress addresses accordingly.

26 more for specific providers, platforms, industries, and regions

Google Postmaster Tools

Google Postmaster Tools is a free dashboard showing how Gmail sees your domain: spam rate, domain and IP reputation, authentication pass rates, encryption, and delivery errors, for senders with meaningful volume.

11 more for specific providers, platforms, industries, and regions

Dedicated vs shared IPs

A dedicated IP is used only by your mail; a shared IP pool is used by many senders on the same platform. Dedicated IPs give control over reputation but require volume and warm-up; shared pools borrow the platform's reputation.

21 more for specific providers, platforms, industries, and regions

Complaint feedback loops

Feedback loops (FBLs) are programs run by mailbox providers (Microsoft JMRP, Yahoo CFL, Comcast, and others) that send you a copy or notice whenever a recipient marks your message as spam.

21 more for specific providers, platforms, industries, and regions

Content filters

Content filtering evaluates message text, HTML, links, and attachments for spam patterns: deceptive phrasing, URL shorteners, image-only bodies, mismatched link text, and known malicious domains.

16 more for specific providers, platforms, industries, and regions

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