# `mix mailglass.stability.check`
[🔗](https://github.com/szTheory/mailglass/blob/v1.0.0/lib/mix/tasks/mailglass.stability.check.ex#L1)

Ensures that `Swoosh.Email.t()` types do not leak into the `Mailglass`
public namespace, preventing downstream developers from accidentally coupling
to our internal engine's types.

Exemptions (escape hatches and internals):
- `Mailglass.Message.update_swoosh/2` (official escape hatch)
- `Mailglass.Message.new/2` (deprecated compatibility path during the `1.x` upgrade window)
- `Mailglass.Outbound.send/2` (legacy compatibility bridge; `deliver/2` is canonical)
- `Mailglass.Compliance` (internal utility)
- `Mailglass.Adapters.*` (internal implementations)

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*Consult [api-reference.md](api-reference.md) for complete listing*