Name
dsn=
Synopsis
When sendmail bounces a message, it notifies the envelope sender of the problem using DSN. A critical part of DSN is the error code, which provides more detail than the usual SMTP error code. A DSN error code, as reported with syslog, looks like this:
dsn=5.7.0
Here, the 5 means it was a permanent error, and
the 7 means it was a security or policy rejection.
The meanings of DSN status codes are documented in RFC1893.
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