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Description of problem:
With Postfix Version 1.1 Patchlevel 11 there is note:

- The SMTP server now disallows RCPT TO:<"">, just like it disallows
  RCPT TO:<>.

I am running Postfix in production enviroment with many users. I am little bit
worried about if this bugfix is missing from my Postfix software. Will it cause
more spam to be accepted?

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Read much of http://www.postfix.org/
2. Discover things that worry sysadmins.

Expected Results:  Postfix should disallow RCPT TO:<"">, just like it disallows
RCPT TO:<>.

Additional info:

RH7.3 package version is postfix-1.1.7-2.