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Postfix Documentation
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Using the Postfix fast ETRN service

The following is an example SMTP session that shows how an SMTP client requests the ETRN service. Client commands are shown in bold font.

220 my.server.tld ESMTP Postfix
helo my.client.tld
250 Ok
etrn some.customer.domain
250 Queuing started
quit
221 Bye

As mentioned in the introduction, the mail is delivered by connecting to the customer's SMTP server; it is not sent over the connection that was used to send the ETRN command.

The Postfix operator can request delivery for a specific customer by using the command "sendmail -qRdestination" and, with Postfix version 1.1 and later, "postqueue -sdestination".

Postfix Documentation
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