Blog

Cold Email Weekly.

Long-form writing on deliverability, infrastructure, and agency operations. One post a week. No fluff.

Monitoring May 21, 2026 8 min read

Why your cold email keeps going to spam: the leading indicators you're ignoring

Cold-email senders find out their domains are dead two weeks after they died. Here are the leading indicators that surface decay before deliverability collapses, and how to monitor them.

Read

Cold Email Weekly

Subscribe to Cold Email Weekly

Long-form writing on deliverability, infrastructure, and agency operations. One post a week, no fluff.

Stop babysitting your inboxes.

MailNurse watches every mailbox and fixes what breaks, so you can spend your time on campaigns that book meetings.

Try Pro free → Book a demo

14 days of Pro free · No card needed · Free plan after