Koltrix
Product
Promise 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
Team inboxThe cc and bcc rules every team should agree on
When to cc a teammate, why bcc backfires, how to leave a thread politely, and what to do when a customer copies half their company. A team FAQ you can adopt.
5 min read
Email APISending email on behalf of your customers' domains
SaaS platforms that send as their customers need domain verification, per-tenant DKIM and isolated reputation. The architecture and the onboarding flow.
5 min read
Customer supportE-Commerce Order Emails: Handling the Replies Customers Send
Customers reply to order and shipping emails with real questions. How to route those replies, handle the common ones fast, and prepare for peak season.
4 min read
AI & emailDefending AI email assistants against hidden instructions
Layered defenses against prompt injection in email: capability limits, human approval, untrusted-content handling, hidden HTML, tool chains and logging.
5 min read
DeliverabilityBIMI readiness checklist: DMARC, SVG and certificates
Everything you need before a BIMI logo shows up: DMARC at enforcement, an SVG Tiny PS logo, an optional VMC or CMC, and a correctly formed DNS record.
5 min read
GuidesHow to give contractors limited access to team email
A runbook for giving freelancers and agencies access to team email: own accounts, only the mailboxes they need, 2FA, an end date and a clean offboarding.
4 min read
GuidesSetting Up Email for a New Hire in Under an Hour
A new hire's email setup takes under an hour with a checklist: address, 2FA, shared mailbox access, signature, aliases and the rules of the road.
4 min read
DeliverabilityAligning DKIM when a vendor sends on your behalf
CRM, billing and support tools often sign with their own domain. How to get vendor mail DKIM-aligned with your From domain before enforcing DMARC.
4 min read
StartupsInvoice and Receipt Emails: Small Details That Cut Billing Tickets
Most billing tickets start with a confusing invoice email. The fields to include, who should receive it, and why the reply address matters more than design.
4 min read
Customer supportVerifying identity before account-access requests by email
A support runbook for email requests to change an owner address, disable 2FA or transfer an account: why email alone is weak proof and how to verify safely.
4 min read
Email APIQueueing outbound email: why sends should be async
Sending email inside a web request couples your latency to someone else's SMTP server. A queue-based design with workers, retries and dead letters.
4 min read