#Anti-Spam
A Report Form for a Static Site with No Backend
A calculator site made entirely of static files has no server to handle forms, but users still need a way to report mistakes in the formulas. This article covers the one approach I chose—a single worker file that accepts POST requests on one route, verifies Turnstile on the server using the real client IP, accepts images pasted from the clipboard, and sends email from the network edge—along with three traps that cost me an entire night.
Mailbox Compromised or Just Password Guessing? Prove It First
Telling a customer their account has been compromised is an allegation that needs decisive evidence first. This article covers what counts as decisive evidence, two cases with opposite outcomes, and the case I nearly reported incorrectly.
Stolen Mailbox Password Sent 1,786 Spam Emails Unseen by CSF/LFD
A real case of a stolen mailbox password used to send 50-75 spam emails a day, below a limit of 200, for 4 straight weeks without a single response from CSF/LFD/BFM because they only count failed authentication attempts, with the decisive question of whether an account was compromised or merely under attack, exim forensic commands, and a blocklist removal playbook
Reading exim mainlog for Stuck Clients — Mail Forensics Part 1
How I read /var/log/exim/mainlog to distinguish an office machine using the wrong password from an attacker running a brute force attack, with the commands I use when customers need answers fast.