Koltrix
Guides
How to Evaluate an Email Tool in a Week-Long Trial
A week is enough to evaluate an email tool if you test the right things in the right order. A day-by-day plan for domains, delivery, team workflow and exit.
4 min read
Team inboxCovering a teammate's inbox during vacation without chaos
A before, during and after checklist for vacation cover: out-of-office text that routes people, in-flight threads, decision limits and the return-day catch-up.
5 min read
Email APIVersioning transactional email templates like code
Keep templates in the repo, review them like code, render them in tests and roll changes out safely so a typo never reaches a million inboxes.
4 min read
ComparisonsZendesk Alternatives for Startups That Live in Email
Zendesk fits large multi-channel support teams. If your startup's support mostly happens over email, these alternatives may fit better. A fair guide by need.
4 min read
Customer supportOutage communication over email: before, during, after
Copy-ready email templates for outages: first notice, updates, resolution and post-incident summary, plus cadence, who sends, and handling the inbound flood.
5 min read
DeliverabilitySPF ~all vs -all: what each qualifier does in practice
Softfail or hard fail? How receivers treat ~all and -all today, why DMARC changed the calculus, and which ending to pick for each kind of domain.
4 min read
StartupsLifecycle Email Metrics That Matter (and Vanity Ones to Drop)
Open rates stopped meaning much once mail clients began prefetching images. The lifecycle email metrics worth tracking instead, email type by email type.
5 min read
GuidesHow to pilot AI drafting with a small group first
Run a two-week AI drafting pilot with two or three people: pick categories, rate edits, log failures, set go/no-go criteria, then roll out with a style guide.
4 min read
DeliverabilityThe SPF 10-lookup limit: how to count and get back under it
Which SPF mechanisms count toward the 10-lookup limit, how to audit your record by hand, and the safe ways to trim includes before you hit permerror.
5 min read
GuidesQuestions to Ask an Email Vendor About Security and Data
Before you move company email to a new vendor, ask where the data lives, who processes it, and how you get it back out. A question list, with our own answers.
4 min read
AI & emailTone control for AI drafts: formal, friendly and firm
The same customer reply written formal, friendly and firm, with notes on what changed, prompts that steer AI tone, and how to strip over-apology and filler.
4 min read
GuidesDNS TTL strategy for email authentication changes
Lower TTLs before you change SPF, DKIM or MX, and know which caches ignore you. A practical timeline for authentication changes without surprises.
5 min read