# `MishkaCmsCore.Mail.Workers.DeliverWorker`
[🔗](https://github.com/mishka-group/mishka_cms_core/blob/v0.0.1/lib/mishka_cms_core/mail/workers/deliver_worker.ex#L5)

Sends one queued email (see `MishkaCmsCore.Mail`), on the `mail` queue.

The job carries the delivery's id, its site, its idempotency key and the email sealed with the
endpoint's key — a reset or sign-in email holds a token, and finished jobs stay in `oban_jobs`
for a week. It carries no provider key: the provider reads its own when the job runs.

A failure the provider calls worth retrying (`MishkaCmsCore.Mail.Provider.retry?/1`) is retried
with Oban's backoff, with the same idempotency key; anything else, and the last attempt, ends
the delivery `:failed`. A site that lost its provider in the meantime ends it `:not_configured`.
Once the provider has answered, the site's history older than `mailer.history_days` goes
(`MishkaCmsCore.Mail.prune/1`).

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