12 and later)
-OBadRcptThrottle=num ?†? command line (V8.12 and later)
define(`confBAD_RCPT_THROTTLE??,`num??) ?†? mc configuration (V8.12 and later
Here, num is a textual representation of a positive integer. If num is negative, non-numeric, or
zero (the default), bad RCPT To: commands are accepted without penalty. If num is positive,
only that number of bad RCPT To: commands are allowed in a single SMTP session before a
penalty is imposed.
The penalty begins by logging the following warning:
other site: Possible SMTP RCPT flood, throttling.
Thereafter, every RCPT To: command will be received by the local sendmail, which will
sleep for one second before replying. The choice of one second is hardcoded in sendmail
and cannot be changed.
The BadRcptThrottle option can be used in combination withth e MaxRecipientsPerMessage
option (?§24.9.73 on page 1050) to further limit the number of recipients per message.
The BadRcptThrottle option is safe. Even if it is specified from the command line, sendmail
retains its special privileges.
24.9.10 BlankSub
Set unquoted space replacement character All versions
Some mailer programs have difficulty handling addresses that contain spaces. Such
addresses are bothillegal under RFC2821 and RFC2822 and subject to gross misinterpretation.
For example, the address:
John Q Public@wash.dc.gov ?†? decidedly not kosher
is viewed by some MUA programs as being composed of three separate addresses: John, Q,
and Public@wash.
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