Notes from the email trenches.
Deliverability, DNS, protocols, pricing. Written by the team building JustEmails.
Fix MX Record Pointing to Wrong Server After DNS Migration
Wrong MX after migration? Fix stale DNS before more mail disappears.
Fix a DKIM Key That Is Too Short: Rotating From 1024-Bit to 2048-Bit
Your DKIM key is too short. Gmail noticed. Here's how to fix it without breaking a single email.
Fix Email Stuck in the Outbox From an SMTP Relay Misconfiguration
Your email won't send — stuck spinning in the outbox. Here's how to diagnose SMTP auth failures, wrong ports, and relay misconfigurations.
Franchise Email Cost Breakdown: 10 to 200 Locations (2026)
Per-seat email pricing crushes franchise margins. The 257x cost gap revealed.
Fix TLS Handshake Failures on SMTP Connections
Debug TLS handshake errors on SMTP with OpenSSL commands.
Fix When SPF Passes but DKIM Fails on Forwarded Newsletters
DKIM fails on forwarded email because body hashes break. Here's how ARC fixes it.
JustEmails vs Self-Hosting Mailcow: The True Cost After VPS and Maintenance
Mailcow looks free. VPS, IP warming, and 2 AM cert renewals tell a different story.
50-Domain Agency Email Cost: Flat-Fee vs Per-Mailbox (2026 Math)
50 domains costs $42K/year on Google—or $49 flat-fee. The math changes everything.
Business Email Security Glossary: 40 Terms Every Admin Should Know (2026)
40 email security terms in plain English — from phishing to DMARC.
How to Set Up a Shared Team Inbox on Your Custom Domain (Without Help-Desk Software)
Create support@, sales@, or any shared team inbox using aliases and standard IMAP clients—no Zendesk or Freshdesk required.
Static Site Form SMTP: Connect Formspree & Web3Forms to Your Domain
Stop losing leads to spam. Route static site forms through your SMTP.
Fix Mailbox Storage and Attachment Size Limit Problems on Custom Domains
Stop bounced attachments and storage quota errors on custom domain email with these actual fixes.