43.16 Dots in local parts
RFC 2822 forbids empty components in local parts. That is, an
unquoted local part may not begin or end with a dot, nor have two
consecutive dots in the middle. However, it seems that many MTAs do
not enforce this, so Exim permits empty components for compatibility.
I wonder if this should be made a compatibility switch, disallowing
them by default? The reason is, in my (admittedly naive)
implementation, I have been doing file existence tests with the
local_part, and I just noticed that there are occasionally some .
files in the directory (not to mention . and .. of course). The file
tests pass with local parts like ., .., and on Mac OS X typically
.DS_Store and such as well.
I'll add a deny in myself:
deny local_parts = ^[.]
Alternatively to making it a configuration option akin to
percent_hack_domains, adding the line above (or like) to the default
configuration might not be a bad idea? BTW, the pattern ^\. did not
work (it denied everything) - should it?
Thanks,
Peter.
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