For example, the following rule
in the parse rule set 0 would cause all mail to the local user George Washington to bounce:
RGeorge.Washington $#error 5.1.1 $: 553 George doesn't sleep here anymore
with an error message such as this:
553 5.1.1
... George doesn't sleep here anymore
20.4.4.1 The $@ dsnstat part when used with the error delivery agent
The $@ part of the error delivery agent specifies either a literal quarantine (?§11.10.2.6 on
page 442) or a DSN code. Here we describe the DSN code.
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20.4 Delivery Agents by Name | 721
Delivery Status Notification (DSN code, see RFC1893) provides a means for conveying the
status of a message??™s delivery. That status is conveyed in the form of a three-part numeric
expression (so as to be easily parsed by machines). This expression is included in the
???machine-readable??? part of bounced messages:
success.category.detail
Each part is separated from the others with dot characters. There can be no space around
the dots. The parts are numeric, and the meanings are as follows:
success
Was the overall delivery attempt a success? This part can be one of three digits. A 2
means the message was successfully delivered. A 4 means delivery has failed so far but
might succeed in the future.
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