[Mailman-Users] Hostile address error

[Sean]

A list admin of a mailman server I administrate brought this error to my
attention when attempting to add an address that contained a forward slash
in the local part(real address not provided for security reasons):

  test/test at example.com  -- Hostile address (illegal characters)

The admin pointed out that rfc 822 states that the / is permitted in the
local part of an email address.

I suppose that Mailman has it reasons for not permitting an address that
contains a / but it would be nice to know what the reasons are to pass
long to the admin.  Can anyone provide any input on this?

Thanks,
-Sean