If hops is missing, the value becomes zero and causes
all mail to fail with the error:
sendmail: too many hops (0 max)
If the entire MaxHopCount option is missing, hops defaults to 25. A good value is 50 or more
(RFC2821, Section 6.2, suggests 100). This allows mail to follow a fairly long route
through many machines (as it could with UUCP) but still catches and bounces mail caught
in a loop between two machines.
The MaxHopCount option should not be confused with the -h command-line switch(?§6.7.26
on page 242). The MaxHopCount option specifies the maximum number of hops allowed,
whereas the -h command-line switch presets the (beginning) hop count for a given email
message.
The MaxHopCount option is not safe. If specified from the command line, it can cause sendmail
to relinquish its special privileges.
* The IP transport protocol also has the concept of hops. A message going from one machine to another has
only one mail hop but can have many IP hops.
?? Actually, any header that is marked with an H_TRACE flag (?§25.6.17 on page 1142) is counted.
This is the Title of the Book, eMatter Edition
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24.9 Alphabetized Options | 1047
24.9.68 MaxMessageSize
Maximum incoming ESMTP message size V8.7 and later
The SIZE keyword to the MAIL From: command states how big an incoming message is in
bytes.
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