Koltrix
Guides
Picking a Domain With Email in Mind
Your domain ends up in every address you hand out. How to pick one that is easy to say, hard to spoof, and safe from the registrar mistakes that lose email.
4 min read
Customer supportFrom support email to engineering ticket: a handoff template
A copyable internal ticket template for escalating bugs from support email to engineering, plus how to keep the customer informed while the fix is pending.
5 min read
DeliverabilityMicrosoft SNDS and JMRP: monitoring Outlook reputation
SNDS shows how Outlook.com rates your sending IPs; JMRP forwards complaints. How to enroll, what the colors mean and how to act on the data.
5 min read
ComparisonsGmail Delegation vs Google Groups vs a Shared Inbox
Three ways to share email inside or alongside Google Workspace. How delegation, Groups and shared inbox tools handle ownership, replies and visibility.
4 min read
AI & emailDrafting follow-ups with AI without sounding robotic
Before-and-after examples of AI-drafted follow-ups after silence, after a meeting and after a fix, with the edits that remove filler and add a clear next step.
5 min read
DeliverabilityRotating DKIM keys without dropping a single message
A selector-based DKIM rotation plan: publish the new key, switch signing, keep the old key long enough, then revoke it with an empty p= tag.
4 min read
ProductKoltrix Billing: Monthly or Annual, Dollars or Rupees
Koltrix plans come in monthly and annual billing, priced in US dollars and Indian rupees. The real numbers, the annual math, and how to choose for your team.
5 min read
Team inboxTeam inbox metrics worth tracking, and the ones to ignore
Which shared inbox numbers tell you something real, which ones mislead, and how each can be gamed. A decision table for small teams measuring email work.
4 min read
Email APIHard vs soft bounces: classifying SMTP replies correctly
A 5xx is not always permanent and a 4xx is not always harmless. Build bounce classification on reply codes and enhanced status codes, with exceptions.
4 min read
StartupsFrom Trial to Sales Call: Emails for Product-Qualified Leads
When trial usage says someone is ready to talk, the email that hands them from automation to a human matters. How to write it without sounding creepy.
5 min read
GuidesHow to write an auto-acknowledgment email that sets expectations
What an automatic reply should say, what it should never pretend, three copyable templates, and how to stop two auto-responders from emailing each other.
5 min read
GuidesTwo email providers on one domain without breaking auth
Running a workspace mailbox provider and a transactional sender on the same domain? Combine SPF, give each its own DKIM selector, and align DMARC.
5 min read