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This service receives an envelope over the Nym mixnet and delivers the
already encrypted YAMN packet to an allowlisted SMTP entry through Tor.
+Transient Tor connection failures are retried three times with bounded
+backoff before the SMTP transaction begins. Errors after SMTP commands start
+are not retried automatically because the remote acceptance state may be
+ambiguous.
+
The Nym address is generated by the persistent client identity and printed at
startup. It must be copied to `YAMN_NYM_RECIPIENT` on the sending web service.