Transactional, notifications, and bulk, and why mailbox providers treat them differently.
6 min read
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Become an email pro.
A short course on getting email into the inbox. Check your own domain, plan a warm-up, and set up IP pools as you go.
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What counts as transactional, and when you need an unsubscribe link.
7 min read
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Split streams so a bad newsletter day never touches your password resets.
7 min read
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The DNS records that prove your mail is yours, with a live check of your own domain.
9 min read
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Start small, send to people who want your mail, and grow while the numbers stay clean.
8 min read
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Shared or dedicated, stream, tier, or customer pools, and how mail picks its IPs.
8 min read
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Bounces, spam reports, blocklists, and what to do when one shows up.
9 min read
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Inbound hosts, MX records, and replies that reach your app.
8 min read
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Clusters, subdomains, tenants, suppressions, and keys, in the order that keeps mail flowing.
9 min read
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Grade your domain in a few seconds.
Enter a domain. We read its SPF, DKIM, DMARC, and MX records and explain each one.
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Start a PostShiba trial and send from a domain you just checked.