About Signal & Sequence

Signal & Sequence covers outbound infrastructure: the authentication records, sending reputation, sequencing logic and list data that decide whether an outbound programme reaches anyone.

Signal & Sequence is a technical letter about outbound go-to-market systems: the records that decide whether mail lands, the sequencing logic behind a campaign, and the data that feeds both. Written for the person who owns the stack, not the slide.

Written for Outbound engineers, demand-generation operators and the agencies who run sending infrastructure for other people.

Who writes here

Tobias Renn, Founding writer. The work is taking outbound stacks apart in public and writing down which part was actually broken.

Yara Mensah, Deliverability correspondent. The beat is authentication records, sender reputation and the long tail of reasons mail does not arrive.