Koltrix
Guides
Merging Email After Acquiring a Small Product
Buying a small SaaS product means inheriting its domains, senders and lifecycle emails. A practical plan for taking over its email without breaking anything.
5 min read
GuidesMoving Your Company Email to a New Domain After a Rebrand
A rebrand means new email addresses, but the old domain keeps receiving mail for years. How to switch addresses, authenticate both domains and avoid lost mail.
5 min read
GuidesConsolidating Several Email Vendors Into One
Mailbox host, sending API, help desk, newsletter tool: when merging them pays off, which to move first, how to clean up DNS, and when to keep a specialist.
5 min read
GuidesBudgeting for an Email Migration: Time, Tools and Risk
An email migration costs more than the new subscription. A worksheet for the hours, overlap fees, archive storage, tools and risk buffer to plan for up front.
5 min read
GuidesMoving from Google Workspace: the DNS cut-over checklist
The exact order of operations for moving a domain's email off Google Workspace without losing a single message, plus what Koltrix does not import yet.
2 min read
- Guides
Migrating Away From Fastmail or Proton Mail: A Practical Checklist
A checklist for moving a custom domain off Fastmail or Proton Mail: exporting mail, recreating aliases, switching DNS, and the extra steps encryption adds.
5 min read
- Guides
Switching Transactional Email Providers With Zero Downtime
Moving your app's email to a new provider doesn't need a risky big-bang cut-over. Dual DKIM, a thin sending interface, gradual rollout and suppression export.
4 min read
GuidesMigrating Aliases, Groups and Shared Mailboxes Without Losing Mail
User mailboxes get migrated. Aliases, groups and catch-alls get forgotten, then mail bounces. How to map every address before cut-over and test it after.
4 min read
GuidesWhat to Do With the Old Mailbox After You Migrate
The MX records have moved and new mail is flowing. Now decide what happens to years of old email: keep it, export it, archive it, or let it go, and when.
5 min read
GuidesEmail Migration Rollback Plan: When the Cut-Over Goes Wrong
Most email migrations go fine, but the bad ones go badly fast. A rollback plan: triggers, the DNS values to save, and how to reconcile mail after reverting.
5 min read
GuidesBefore Any Email Migration: Inventory Everything That Sends as You
Most email migrations break something nobody listed: a CRM, a form, a scanner. How to find every service that sends as your domain before you change DNS.
4 min read
GuidesLeaving Web-Host Email (cPanel) for a Real Business Inbox
The email bundled with your web hosting was fine to start with. Why it causes trouble as you grow, and how to move mail off cPanel without breaking your site.
5 min read