Update "squirremail" package to version 1.4.21. Changes since 1.4.20:

- Now allow more than one plugin to control the compose form submit action.
- When sorting by received date, the received date is now shown on the
  message list.
- Explicitly disable browser caching for left_main and right_main pages
  (#2983134).
- Fix error with SpamCop reporting plugin not being able to send report as
  emails (#1795310).
- Fix typo in SpamCop plugin.
- Reduced default time security tokens stay valid from 30 days to 2 days
  (reduces chances of session data growing too large)
- Several speed enhancements for recent fixes regarding the display of
  encoded subjects, including a fix for messages with invalid subject
  encoding (includes #2987016 amongst several other issues reported via
  mailing list, etc.) (Many thanks to Zdenek Pytela for the untiring help
  diagnosing and testing.)
- Fixed minor vulnerability in Mail Fetch plugin.
  [CVE-2010-1637/TEHTRI-SA-2010-009]
- Now properly quote personal part of encoded addresses when replying.
- Now fill in default subject when forwarding as attachment (#2936541).
- Implement header folding that doesn't add extraneous spaces so unfolding
  is less ambiguous (#1951776).
- Fixed issues caused by use of PostgreSQL keyword "user" in SquirrelMail's
  default preferences database schema (#2943483).
- Fixed attachment filename decoding problems (#2994865).
- Now default search criteria to the TO header when searching the sent folder.
- Fixed literal processing of 8-bit usernames/passwords during login.
  [CVE-2010-2813]

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