Recent Posts

Deliverability Summit 2024

We just got back from Amsterdam a couple of days ago, after attending the Deliverability Summit.

Anatomy of a Received header

When trying to find out why Something Went Wrong during delivery of an email we sometimes want to look at the route by which it was delivered.

Looking back, looking forward

Six years ago today I wrote here “Spam isn’t going away“, talking about systemic problems at Google, Cloudflare and Amazon and in India.

TXT Records

DKIM public keys live in DNS TXT records. A DNS TXT record contains strings of text, and each string is limited to be no more than 255 characters long.

The worst thing about the yahoogle requirements has been their use of the term “one-click unsubscribe”. It’s an overloaded term that’s being used here to mean RFC 8058 in-app unsubscription. That’s a completely different thing to what one-click unsubscription has been used to mean for decades, often in the context of complying with legal requirements around unsubscription.

Don’t trust Gmail’s Show Original

It’s not always easy to know what the actual headers and body of an email as sent look like. For a long time accepted wisdom was that you could send a copy to your gmail account, and use the Show Original menu option to, well, see the original message as raw text.