Koltrix
Guides
A Professional Email Setup for Solo Consultants
How a solo consultant can set up domain email that looks established and stays cheap: domain, aliases, signature, client filing and adding a subcontractor.
4 min read
AI & emailPrimary, Other, Cold pitches, Newsletters, Updates: why five
Why Koltrix sorts mail into five fixed categories instead of dozens, what belongs in each one, how teams work through them, and where custom labels still fit.
5 min read
DeliverabilityBusiness email compromise: invoice fraud red flags
BEC scams change bank details or rush payments through email. Spot the red flags, add out-of-band verification and harden accounts against takeover.
4 min read
StartupsA 14-Day Onboarding Email Sequence for B2B SaaS
Seven onboarding emails for the first two weeks of a B2B SaaS account, each with a goal, a trigger, a skip rule and a subject line you can adapt today.
5 min read
GuidesEvaluating AI email tools: a buyer's checklist
A practical checklist for evaluating AI email tools: what runs without approval, data use, admin controls, accuracy on your mail, exports and pricing clarity.
5 min read
DeliverabilitySpam traps: pristine, recycled and typo traps explained
Spam traps are addresses that should never receive your mail. How each type ends up on lists, what hitting them signals and how to stop it happening.
5 min read
ComparisonsGoogle Workspace Alternatives for SaaS Teams: An Honest Roundup
Microsoft 365, Zoho Mail, Fastmail, Proton Mail and Koltrix compared for SaaS teams: who each one suits, where Workspace still wins, and how to decide calmly.
5 min read
Customer supportEmail SLAs for small support teams: targets you can keep
How a small support team can set email response targets by tier, choose business or calendar hours, publish expectations, and handle the misses honestly.
4 min read
GuidesReading Authentication-Results headers like a receiver
The Authentication-Results header records the SPF, DKIM and DMARC verdicts a receiver reached. Decode each field and use it to debug failures fast.
5 min read
GuidesEmail Setup for Agencies Managing Many Client Domains
A practical system for agencies that touch email on dozens of client domains: who owns DNS, how to get access, what to record, and how to offboard cleanly.
5 min read
Team inboxWhen does a team actually need a shared inbox?
The signals that forwarding hello@ to one person has stopped working, plus a decision table for choosing between staying put, an alias, or a shared inbox.
5 min read
Email APIMagic links vs email OTP codes: speed and security
Passwordless login lives or dies on email delivery. Compare magic links and one-time codes on security, link scanners, latency and cross-device use.
5 min read