[Bug 680447] [NEW] parts of recipients adresses between square brackets in are interpreted as seperate addresses

[yalu]

Public bug reported:

We use max_num_recipients as a vague spam detector and came to the
conclusion that when counting, extra addresses are counted if an address
contains [square brackets]. Example:

test at lists.example.net, jefke [jefke2 at foo.example.net],
jefke3 at example.net, jefke4 at example.net

in the To: or Cc: field will be counted as 6 adresses. I reckon this is
interpreted as an array and flattened or something.

(Yes, []'s are illegal in mail adresses but we receive messages like
that anyway).

Proposed solution: 's/\]/\\]/g' 's/\[/\\[/g'

** Affects: mailman
     Importance: Undecided
         Status: New

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parts of recipients adresses between square brackets in  are interpreted as seperate addresses
https://bugs.launchpad.net/bugs/680447
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