Original sentence: A domain may also define ; they have no mailboxes and forward messages without changing any part of their envelopes<ref>The envelope of a message is the data transmitted in an SMTP transaction before transmitting the content of the message.Chain E-mail.E-Mail Letter.E-mail alias.E-mail client.E-mail spam.Electronic mailing list.Email administrators sometimes use the term redirection''' as a synonym for server-based email-forwarding to different recipients.Email alias and forwarding in Gmail.Google - E-mail Forwarding.In particular, the envelope holds the Return-Path (a.Indeed, if A publishes an SPF policy that prevents B from using A's name, and C applies sender's policy-checking, C may refuse the message according to RFC 4408.Reply All.The envelope is lost when the message is delivered, although some of its fields may be saved by the receiving server in the message's headers.bounce address, MAIL FROM argument, mailfrom, or mfrom) and one or more recipients (including Bccs).de:Mail-Umleitung.forward file.sendmail and the
Edited sentence: A domain may also define ; they have no mailboxes and forward messages without changing any part of their envelopes.Email administrators sometimes use the term redirection as a synonym for server-based email-forwarding to different recipients.Indeed, if A publishes an SPF policy that prevents B from using A'''s name, and C applies sender's policy-checking, C may refuse the message according to RFC 4408