Deliverability & DNS

SPF, DKIM, DMARC setup guides, DNS record configuration, inbox placement troubleshooting, and deliverability monitoring for self-hosted email.

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A conveyor of identical envelopes passing a checkpoint stamp

Website Transactional Email That Actually Arrives

Order confirmations and password resets are configured once by whoever built the site and never examined again. This covers why direct-from-server sending fails on every platform, the three pieces that fix it, and when a transactional provider is the right answer.

Aug 30, 2026 · Alexey Bulygin

A long ticket strip being torn off against a stack of address cards

Email Verification Credits: What They Cost and How Many You Need

One credit checks one address; deep mode costs two and resolves the catch-all cases standard mode has to guess at. This covers the price ladder, why you need more credits than addresses, and the things verification cannot fix.

Aug 26, 2026 · Alexey Bulygin

A sorting tray with most letters passing through and a few set aside for review

Reading Your Spam Statistics Before They Become a Problem

Most providers show you how much junk they blocked, which is marketing. The useful figures are how often the filter was wrong and what your own people reported — this covers which movements signal trouble and what to do about each.

Aug 26, 2026 · Alexey Bulygin

Several letters leaving one building by separate marked chutes

White Label SMTP: Your Brand, Each Client's Own Sending Path

Some clients will not send through anyone else's servers — warm IPs, a contract that names the path, or plain institutional caution. This covers how per-domain branding and per-domain sending compose, and where the DNS work actually lands.

Aug 13, 2026 · Alexey Bulygin

A sending-volume ramp chart for a new domain during warm-up

Sending Limits and Domain Warm-Up: Why New Domains Get Filtered

A brand-new domain has no reputation, and volume from nowhere is indistinguishable from a compromised account. This is what the caps protect and how to ramp a domain without getting filtered.

Aug 2, 2026 · Alexey Bulygin

Webmail spam controls showing report spam, not spam, and blocked senders

Blocking a Sender vs Training the Filter (They Do Different Things)

Three controls look interchangeable and are not: moving a message to Junk, reporting it as spam, and blocking the sender outright. Using the wrong one is why the same newsletter keeps arriving after you have dealt with it four times.

Aug 1, 2026 · Alexey Bulygin

Bring Your Own SMTP: When to Relay Through SES, SendGrid or Mailgun

Managed sending is the right default, and there are three specific situations where relaying through your own provider beats it. There are also two where people do it for reasons that turn out to be wrong.

Jul 30, 2026 · Alexey Bulygin

Verification results grouped into deliverable, risky and undeliverable categories

Email Verification: What the Checks Actually Prove

Vendors advertise a single accuracy number, which hides the fact that different checks have wildly different reliability. Some are deterministic; the SMTP mailbox probe is not, and at Gmail it proves nothing at all.

Jul 28, 2026 · Alexey Bulygin

A preview of MX, SPF, DKIM and DMARC records about to be created automatically

Automatic Email DNS Setup: One Click, or One Token for Every Domain

Hand-typing six DNS records per domain is how typos reach production. Domain Connect handles a single domain with an authorise-and-return flow, and a scoped Cloudflare token handles a hundred in one pass, with a preview of every change first.

Jul 27, 2026 · Alexey Bulygin