Where did your email actually land - inbox or spam? APRF is a new IETF draft: publish one DNS record, get daily placement + engagement reports by email. Like Google Postmaster Tools, but from any mailbox provider. Plain-English guide + 3 free tools: postboxservices.com/blogs/po…

TLS certificate lifetimes are already down to 200 days. 100 in Mar 2027. 47 in Mar 2029. Everyone read this as a web story. It's also an email story. MX, MTA-STS, TLS-RPT, DANE and BIMI all sit on that clock. And unlike the web, mail fails quietly. postboxservices.com/blogs/po…

The fix: Long term - DKIM2 (an IETF draft) binds each signature to its intended recipients. Today - set a short DKIM signature expiry, so a captured message can't be replayed forever.

And this isn't theoretical. In 2025, DKIM replay spoofed PayPal, Apple, and even Google's own [email protected]. Real senders. Real signatures. Fake intent.

"Just enforce DMARC" won't save you. A replay carries a real, aligned DKIM signature, so DMARC passes via DKIM. p=reject only blocks what fails. A replay doesn't fail.

The uncomfortable truth: A DKIM "pass" only proves a message was signed by a domain. Not that the domain sent THIS copy, to you. DKIM signs the message - not the delivery.

The trick: They type the fake charge + phone number into a field PayPal lets you fill in yourself. PayPal then generates and DKIM-signs a 100% genuine email to an inbox they control. They forward that signed message to thousands. The signature stays valid.

A "PayPal invoice" hits your inbox. DKIM: ✅ valid DMARC: ✅ passed It genuinely came from PayPal's servers. And it's a scam. The attacker never touched PayPal. Here's how that's possible 🧵

We just shipped 6 free email tools. No login. No limits. No catch. Everything we wished existed when we started in 2019 - built and free for anyone who needs it. Thread 🧵

Check out our third interview with @damien_brnl from @MailReachApp on the importance of #email #warmup and #deliverability. The next interview is with Anders Berggren from @halon_io postboxservices.com/blogs/po… #emailmarketing #emailgeeks #emailcampaign #emaildeliverability