Koltrix
Guides
Hidden Costs in a Multi-Vendor Email Stack
Mailbox host, sending API, help desk, newsletter tool. Subscriptions are the visible part. What a split email stack costs in time, DNS and lost replies.
5 min read
Customer supportB2B support email when an account has many stakeholders
When five people from one customer email you separately, answers drift and context gets lost. A playbook for handling multi-stakeholder B2B support by email.
5 min read
GuidesEmail not received? A systematic debugging order
When a customer says your email never arrived, work the problem in order: your logs, the SMTP response, authentication, filtering, then the recipient.
4 min read
ComparisonsSuperhuman Alternatives When You Need a Team Inbox
Superhuman makes one person fast at email. If your real problem is shared addresses and team workflow, you may need a different kind of tool. A fair comparison.
5 min read
GuidesHow to find anything in a shared mailbox: search techniques
Worked examples of finding old threads in a shared mailbox: search by sender domain, exact phrase, date range, attachment and label, and combine filters well.
4 min read
DeliverabilityHow to read a DMARC aggregate report, line by line
DMARC aggregate reports are compressed XML that few people read. Walk through each element, what the counts mean, and how to spot spoofing quickly.
5 min read
StartupsLaunch Day Email Checklist for a Small SaaS Team
Launch day is a bad time to discover your signup email lands in spam. A checklist for small SaaS teams covering DNS, testing, support staffing and replies.
4 min read
Team inboxOffboarding a teammate from shared email safely
A runbook for removing a departing teammate from shared email: access, connected apps and AI tokens, owned threads, forwarding rules and their old address.
4 min read
Email APIWhy every transactional email needs a plain-text part
The text/plain alternative helps accessibility, privacy-minded readers, smartwatches and some filters. How to generate a good one rather than a strip.
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
AI & emailA morning briefing with AI: turning overnight mail into a plan
A ten-minute morning routine: check categories, summarize what matters, list what needs a reply, answer three now and defer the rest. Includes a sample prompt.
5 min read
- Deliverability
DKIM body hash did not verify: the usual suspects
When DKIM fails with a body hash mismatch, something changed the message after signing. Find the culprit: footers, rewriters, line endings, encoding.
4 min read