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Notes from the email trenches.

Deliverability, DNS, protocols, pricing. Written by the team building JustEmails.

All (74)Tutorials (33)Comparisons (21)Guides (11)Industry (9)
Cover for GitLab CI SMTP Notifications: 2026 Setup Guide
Tutorials·11 min read

GitLab CI SMTP Notifications: 2026 Setup Guide

GitLab CI SMTP setup with DKIM. Stop missing failed builds.

Cover for DKIM 'Body Hash Did Not Verify': Causes and Fixes
Tutorials·11 min read

DKIM 'Body Hash Did Not Verify': Causes and Fixes

DKIM body hash failed? Something modified your email in transit. Find the culprit and fix it.

Cover for How to Set Up MTA-STS and TLS-RPT in 2026: Enforce Encrypted Mail Delivery
Tutorials·11 min read

How to Set Up MTA-STS and TLS-RPT in 2026: Enforce Encrypted Mail Delivery

MTA-STS setup guide: policy file, DNS, TLS-RPT reports. Stop downgrade attacks.

Cover for Fix Emails Going to Junk in Apple Mail and iPhone (2026)
Tutorials·11 min read

Fix Emails Going to Junk in Apple Mail and iPhone (2026)

Apple junk filtering decoded. Fix it now.

Cover for Stuck in a Mail Loop? Diagnosing and Breaking Email Forwarding Loops
Tutorials·13 min read

Stuck in a Mail Loop? Diagnosing and Breaking Email Forwarding Loops

Your inbox flooded with 847 copies of the same message. Here's how to read Received headers, find the loop, and fix it.

Cover for SPF Breaking From Too Many Includes? Flattening and Macro Fixes That Work
Tutorials·10 min read

SPF Breaking From Too Many Includes? Flattening and Macro Fixes That Work

SPF PermError from 10+ DNS lookups? Flattening and subdomain delegation fix it.

Cover for Drowning in Email Aliases? Audit and Clean Up Address Sprawl
Tutorials·11 min read

Drowning in Email Aliases? Audit and Clean Up Address Sprawl

Audit your email aliases before orphan addresses become security holes.

Cover for Mailbox Full and Bouncing Inbound Mail? Managing Email Storage the Right Way
Tutorials·13 min read

Mailbox Full and Bouncing Inbound Mail? Managing Email Storage the Right Way

Your mailbox hit quota and senders got a 552 bounce. Here's how to diagnose, archive vs delete, set retention, and plan storage so it doesn't happen again.

Cover for Fix Email Reputation on a Purchased Domain (2026)
Tutorials·13 min read

Fix Email Reputation on a Purchased Domain (2026)

Inherited bad email karma? Fix it before your invoices hit spam.

Cover for DKIM Shows 'none' or Unsigned? Fixing Authentication for Third-Party Senders
Tutorials·13 min read

DKIM Shows 'none' or Unsigned? Fixing Authentication for Third-Party Senders

When your CRM, helpdesk, or invoicing tool sends email as your domain but shows DKIM 'none' or unsigned — DMARC fails. Here's how to fix it: publish the vendor's DKIM selector, verify via show-original, and use the subdomain delegation pattern when necessary.

Cover for Email Ports Explained: 25, 465, 587, and 993 — When to Use Each
Tutorials·11 min read

Email Ports Explained: 25, 465, 587, and 993 — When to Use Each

Email ports 25, 465, 587, 993 — which goes where and why ISPs block port 25.

Cover for Fix Custom Domain Spam: Rspamd Tuning Guide (2026)
Tutorials·12 min read

Fix Custom Domain Spam: Rspamd Tuning Guide (2026)

Stop spam on your custom domain. Real Rspamd thresholds, RBL tuning, greylisting tactics.