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
Blog · Guides
Guides
Step-by-step how-tos and migration checklists you can follow from start to finish.
GuidesTesting email locally with a fake SMTP server
Point your app at a local SMTP catcher during development to see every message without risking real delivery. Setup, workflow and what it cannot test.
4 min read
GuidesUsing Claude or ChatGPT with your inbox: a practical workflow
A daily routine for working email through Claude or ChatGPT once connected: summarize unread, find threads, apply labels, draft replies, then review and send.
4 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
GuidesMX records explained: priorities, fallbacks and null MX
How sending servers pick among MX records, what preference values really do, what happens without an MX, and when to publish a null MX instead.
4 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
GuidesHow to write a prompt that summarizes a long email thread
Build a reliable prompt for summarizing long email threads: purpose, audience, a fixed output format, exact numbers and flagged uncertainty, plus an example.
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
GuidesPorts 25, 465, 587 and 2525: which should you use?
Port 25 is for server-to-server relay, 587 and 465 are for submission, and 2525 is a common fallback. What each port expects and why clouds block 25.
4 min read
GuidesHow to plan your inbox for a product launch week
A launch-week email playbook for small teams: snippets and labels to prepare, who covers press, users and partners, daily triage passes, and follow-up after.
5 min read
GuidesSmall Nonprofit Email: Donor Receipts, Volunteers and a Tight Budget
How a small nonprofit can set up email that outlasts volunteer turnover, sends donor receipts reliably, keeps announcements separate and fits a small budget.
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