Koltrix
AI & email
Prompting an AI assistant to search your mail effectively
How AI assistants turn your requests into mailbox searches, and how to phrase prompts with names, dates and domains to find the right thread the first time.
4 min read
DeliverabilityDisplay name spoofing: the attack DMARC does not stop
An attacker can send from any free mailbox with your CEO's name in the display field. Why authentication cannot stop it and what actually helps.
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
Team inboxWhen to split one shared inbox into several
Signals that one shared inbox should become several, the ways to split it (by function, product or region), and the hidden costs of splitting too early.
4 min read
Email APIRate limits for email APIs: handling 429s gracefully
Respect Retry-After, smooth bursts with a token bucket and keep retries idempotent. A practical guide to living within an email API's rate limits.
4 min read
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
Customer supportSpam, abuse and junk in the support queue: keeping it clean
A checklist for separating vendor pitches, SEO spam, signups, bounces and abusive senders from real support mail, with rules, blocking and a review routine.
5 min read
DeliverabilityQuishing: QR code phishing and why filters miss it
QR codes hide malicious URLs inside images, out of reach of many link scanners. How quishing works, why it evades filters and what defenses help.
4 min read
StartupsEmail for EdTech Startups: Planning Around the School Calendar
EdTech email follows the school year: back-to-school bursts, quiet summers, renewal season and several audiences. How to plan sends, volume and tone around it.
4 min read
AI & emailLeast privilege for AI email agents in a team workspace
An admin playbook for AI email agents: inherit user mailbox access, keep a workspace off switch, cut access on removal, scope by task, wall off sensitive mail.
4 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