Koltrix
Comparisons
Microsoft 365 vs Google Workspace for a Startup's First Email
Microsoft 365 or Google Workspace for your startup's first company email? A balanced look at apps, interfaces, admin, ecosystem fit and what neither covers.
5 min read
Team inboxOwnership rules for shared inboxes: who replies to what
A playbook for writing explicit ownership rules in a shared inbox: by topic, customer or rota, how to hand off out loud, and a one-page policy you can copy.
5 min read
DeliverabilityRelaxed vs strict DMARC alignment: choosing adkim and aspf
Relaxed alignment accepts subdomains, strict demands an exact match. See how each mode evaluates real headers and when strict is worth the risk.
4 min read
StartupsWriting Trial-Ending Emails That Don't Feel Like a Shakedown
How to write the trial-ending email so it informs instead of pressures: the facts to state, what to show the user, and before-and-after copy you can adapt.
4 min read
AI & emailWhy AI should draft but a human should send
A bad AI draft costs seconds; a bad sent email costs trust, money or worse. Why the review step between draft and send is a feature, not a limitation of AI.
4 min read
GuidesKeeping staging environments from emailing real customers
Copying production data into staging is how customers get test emails. Use allowlists, recipient rewriting and separate credentials to make it impossible.
4 min read
GuidesMoving Off Microsoft 365: An Email Migration Plan
A step-by-step plan for moving a domain's email off Microsoft 365: inventory, exporting mailboxes, DNS records to change, coexistence, and what to check after.
5 min read
Customer supportFirst response time vs resolution time: which to optimize
First response time is easy to game and resolution time is what customers feel. How to define both, measure them honestly, and know when speed really matters.
4 min read
DeliverabilityDMARC for subdomains: sp=, np= and domains you forgot
Attackers love subdomains you never configured. How sp= and the new np= tag cover them, how policy discovery works, and when to publish per-subdomain records.
4 min read
StartupsActivation Emails: Trigger on Behavior, Not the Calendar
Time-based drip emails nag users who are already active and miss the ones who are stuck. How to define stuck states and send one useful email for each of them.
4 min read
Team inboxShared inbox vs distribution list vs alias: how each one works
Aliases, distribution lists and shared inboxes all route team mail, but they handle replies, read state, history and offboarding very differently. Here's how.
4 min read
Email APIBuilding webhook consumers for retries and disorder
Webhooks arrive late, twice or out of order. Design consumers that acknowledge fast, deduplicate by event, process asynchronously and tolerate disorder.
4 min read