Five tools, free and with no sign-up

1. 01

   Domain checker

   Enter your domain name and see within seconds whether someone can email your clients in your name. Public records only.

2. 02

   Phishing test

   Ten booby-trapped messages, shown as they really arrive, and the test tells you which would have caught you. Five minutes.

3. 03

   DMARC record generator

   This tool composes a valid DMARC record from your answers and explains every tag it writes. It deliberately omits tags left at their default value: a record carrying adkim=r, aspf=r and pct=100 says exactly what a record without them says.

4. 04

   Does your SPF record exceed ten lookups?

   This tool resolves your SPF record recursively and counts the DNS queries it costs. RFC 7208 allows ten; past that, evaluation stops with a permerror and the record stops protecting the domain, with nothing visibly breaking.

5. 05

   DMARC report reader

   This tool opens the DMARC aggregate reports your mailbox providers send every day, as .xml, .xml.gz or .zip, and summarises them in plain language: how many messages were sent in your name, from which IP addresses, and which of them failed. Everything is parsed in your browser.

Public DNS records only. No access to your systems, no scanning, no email sent. Checked domains are not retained.