For example, the following code results in the same exit(2) value as
the preceding code but gives a less informative DSN status line in the bounce
message:
R$* < @ evilhost.domain > $* $#error $@ 65 $: You are bad, go away
?†‘
the value of EX_DATAERR from
*.1.6 EX_NOUSER nouser Address has moved, no forwarding
*.1.7 EX_USAGE usage Address of sender has bad syntax
*.1.8 EX_NOHOST nohost Address of sender is bad
*.2.0 EX_UNAVAILABLE unavailable Mailbox status is undefined
*.2.1 EX_UNAVAILABLE unavailable Mailbox disabled
*.2.2 EX_UNAVAILABLE unavailable Mailbox full
*.2.3 EX_DATAERR Mailbox is too small or message is too large
*.2.4 EX_UNAVAILABLE unavailable Mailbox led to mail list expansion problems
*.3.* EX_OSERR Operating system error
*.4.0 EX_IOERR Network error is undefined
*.4.1 EX_TEMPFAIL tempfail Network: no answer from host
*.4.2 EX_IOERR Network bad connection
*.4.3 EX_TEMPFAIL tempfail Network routing failure
*.4.4 EX_PROTOCOL protocol Network unable to route
*.4.5 EX_TEMPFAIL tempfail Network congestion
*.4.6 EX_CONFIG config Network routing loop detected
*.4.7 EX_UNAVAILABLE unavailable Network delivery time expired
*.5.* EX_PROTOCOL protocol Protocol failure
*.6.* EX_UNAVAILABLE unavailable Message contents bad, or media failure
*.7.* EX_DATAERR Security: general security rejection
5.
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