[CentOS] Postfix + SASL

Hello list.

I have a mail server where I use Postfix+SASL. Everything works fine.
Sending emails when using client (Outlook, Thunderbird or anything
else) require authorization. It is OK.

But on the same server there is a Squirrelmail which sends emails as a
localhost. To send email in this way there is no any authorization.
Besides one preson use PINE on the server...

How to do that authorization is required when you use Squirrelmail or
PINE (localhost)?

Regards
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