[Exim] disabling banner information

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Hi

We are running exim 4.10 on Solaris 2.8.

At the moment if we telnet to port 25 on the server we get the following banner.
220 mail3.wits.ac.za ESMTP Exim 4.10 Wed, 08 Oct 2003 09:25:19 -0200

Is ther anyway we could disable this for security purposes.

Thanks
cheers
sherona
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