DNS and deliverability, explained.

DNS & Deliverability 04 Sep 2026

Why Marketing and Transactional Email Should Use Separate Subdomains

Why campaigns and receipts should not share one From domain. What subdomain splits isolate, what they do not, and how to keep brand reputation clean in 2026.

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DNS & Deliverability 03 Sep 2026

SPF, DKIM, and DMARC on Subdomains: What Inherits and What Doesn't

SPF never inherits. DKIM is per signing domain. DMARC can fall back via sp= or p=. When a sending subdomain needs its own keys, policy, and RFC 9989 tags.

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DNS & Deliverability 02 Sep 2026

Reverse DNS and PTR Records for Email Deliverability

PTR and FCrDNS live on the sending IP, not in your Cloudflare zone. Learn who sets reverse DNS, how to check it, and when branded rDNS is actually your job.

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DNS & Deliverability 01 Sep 2026

DKIM Key Rotation: Overlap Selectors Without Breaking Mail

Rotate DKIM by publishing a new selector first, verifying DNS, switching the signer, then keeping the old key 7–14 days. Never overwrite p= on a live selector.

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DNS & Deliverability 01 Sep 2026

How to Connect a Cloudflare Domain to ArawaMail

Connect a Cloudflare-hosted domain to ArawaMail: unlock Email Routing MX first, keep mail records DNS-only, then activate receiving, sending, and the first mailbox.

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DNS & Deliverability 31 Aug 2026

SPF 10 DNS Lookup Limit: Avoid PermError | ArawaMail

SPF evaluation stops after 10 DNS-querying terms. Learn what counts toward the limit, why multiple v=spf1 records fail, and the cleanup order that fixes permerror without fragile flattening.

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DNS & Deliverability 30 Aug 2026

Amazon SES Suppression Lists: Account, Config Set, and Tenant

SES accepted the send but the receipt never arrived. Map the global, account, configuration-set, and June 2026 tenant suppression lists — and how to look up or remove one address safely.

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DNS & Deliverability 29 Aug 2026

How to Verify a Domain in Amazon SES (Easy DKIM)

Verify an Amazon SES domain identity with Easy DKIM CNAMEs, optional BYODKIM, and custom MAIL FROM. Fix Pending verification and Cloudflare flattening mistakes.

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DNS & Deliverability 26 Aug 2026

From, Reply-To, and Return-Path: What Each Email Header Does

From vs Reply-To vs Return-Path: what each header controls for replies, bounces, and domain alignment—and how to set them correctly for deliverability.

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DNS & Deliverability 20 Aug 2026

How to read a DMARC report

Learn how to read DMARC aggregate XML, interpret source IPs, SPF and DKIM alignment, dispositions, volume, forwarders, and senders that need fixing.

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