Outbound mail queue primitives: DKIM signing, DSN generation, MTA-STS lookup, retry/backoff, with a pluggable store trait and a Postgres reference implementation.
// Each integration test crate only uses the subset of helpers it
// needs. The unused-in-one-crate items are not dead code in
// aggregate, so silence the dead-code lint at the helper-module root.
#![allow(dead_code)]pubmodmock_smtp;pubmodpg;pubmodredis;