==== Required information ====
- iRedMail version: 0.8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 12.04 LTS
- Related log if you're reporting an issue:
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If in the file "/etc/postfix/main.cf" in the option of "smtpd_sender_restrictions" you remove the value 'reject_sender_login_mismatch', does not make the system less secure?