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SMTP 521 Reply Code
RFC 1846

Recipient expansions

Mail trigger To Cc
doc_added_comment mailext-chairs@ietf.org, rfc1846@ietf.org
doc_external_resource_change_requested mailext-chairs@ietf.org
doc_state_edited mailext-chairs@ietf.org, rfc1846@ietf.org
ipr_posted_on_doc rfc1846@ietf.org ipr-announce@ietf.org, mailext@list.cren.net