Mailers Base · Provenance tracking

What is in the file, and what is not.

The brief is the specification, and it is written before the build. Records are reconciled across sources before anything is counted. Every claim the file makes about itself can be checked against it.

Criteria translation

Finding the nearest countable equivalent when a requirement has no direct expression in the available fields.

Syntax screening

Removing malformed and obviously generated addresses before anything is paid to check them.

Null discipline

Keeping empty and unknown distinct, so a filter can tell the difference.

We are comfortable being told the scope was wrong.