Koltrix
Product
Adding Your Domain to Koltrix: The Five DNS Records
Koltrix asks for five DNS records: ownership, MX, SPF, DKIM and DMARC. What each one does, what its value looks like, and the order to publish them in.
5 min read
Blog · Product
Product
Koltrix news and how we build it: what shipped, why, and what we learned along the way.
ProductWhy Koltrix Enforces Send Limits in the API
Koltrix send limits are enforced by the API, not just shown on a page. What each plan allows, what a refusal looks like, and why caps protect your reputation.
5 min read
ProductWhat Koltrix Doesn't Do Yet, and Who Should Wait
An honest list of what Koltrix v1 doesn't include, from IMAP and importers to SOC 2 and SDKs, and the teams for whom waiting or choosing another tool is right.
5 min read
ProductWhere Your Koltrix Data Lives
Koltrix runs on its own servers on OVHcloud in Frankfurt. Where your mail, attachments and AI requests go, who else touches them, and what we don't have yet.
5 min read
ProductHow we send ReminderIt's email
ReminderIt is our other product. Every reminder, receipt and support reply it sends goes through Koltrix. Here is the whole setup, including the awkward parts.
2 min read
ProductPromise Keeper: Tracking What Was Promised Over Email
Promise Keeper tracks every 'I'll send it Friday' in both directions, reminds you before yours is due and drafts a nudge for theirs. You still press send.
5 min read
ProductMeasuring Lifecycle Emails With Koltrix Delivery Events
How to use Koltrix webhooks and message events to measure onboarding, trial and dunning emails by what users do next, not by open rates you can't trust.
5 min read
ProductWhat happens after POST /api/v2/emails returns 202
Follow a Koltrix send from the 202 Accepted response through the queue, DKIM signing, SMTP delivery and the webhook events your app receives.
6 min read
ProductCustomer Loop: Where Replies to Your Receipts Should Go
Customers reply to receipts and password resets all the time. Customer Loop threads those replies into your team inbox under the message that caused them.
5 min read
ProductKoltrix Billing: Monthly or Annual, Dollars or Rupees
Koltrix plans come in monthly and annual billing, priced in US dollars and Indian rupees. The real numbers, the annual math, and how to choose for your team.
5 min read
ProductWhat Happens During and After a Koltrix Trial
Seven days, no card, two seats. What a Koltrix trial includes, what to test while it runs, and exactly what happens to your mail and data when it ends.
5 min read
ProductKoltrix Pricing Explained: Plans, Seats and Send Limits
Koltrix is priced per workspace, with seats included. What each plan includes, how the send limits and AI actions work, and what happens if you outgrow a plan.
4 min read