But what of groupwrite
permission?
Beginning withV8.8 sendmail, the decision of whether to trust group-write permission is
left to the UnsafeGroupWrites option, which looks like this:
O UnsafeGroupWrites=bool ?†? configuration file (V8.8 and later)
-OUnsafeGroupWrites=bool ?†? command line (V8.8 and later)
define(`confUNSAFE_GROUP_WRITES??,bool) ?†? mc configuration (V8.7 and later)
The optional argument bool, when missing, defaults to true (check for unsafe group-write
permission). If this option is missing entirely, it defaults to false (don??™t check for unsafe
group-write permission).
Withth is option set to true, a ~/.forward file or a :include: file withgroup or world writability
will result in one of these four errors being logged:
filename: group writable forward file, marked unsafe
filename: world writable forward file, marked unsafe
filename: group writable include file, marked unsafe
filename: world writable include file, marked unsafe
Any address in the file that is a file or a program will result in a bounce and this message:
Address address is unsafe for mailing to programs
Address address is unsafe for mailing to files
Beginning withV8.10, sendmail uses this option only to set the GroupWritableForward-
FileSafe (?§24.9.39.15 on page 1015) and GroupWritableIncludeFileSafe (?§24.9.39.17 on
page 1016) items in conjunction withth e DontBlameSendmail option, and so has been
deprecated.
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