[Mimedefang] Hardware Recommendation for MD

[Muhammad Talha]

Dear all

i have 2 mail server running Mimedefang , ClamAv , Openwebmail ,
The machines have following specs

Compaq Proliant 1600           Sun Ultra Sparc E250
Pentium II                               RAM 1 GB
RAM 1 GB                             OS: Solaris 9
OS : Linux
Mail Volume  35 message/minute           25 message/minute

i want to make "Single Mail Gateway Machine for Filtering"
i have following spec machine avaible for that

Entry Level Server Dual Processor Board                    Preferred
Software
1 Processor Pentitium III 1200 MHZ                           OS : Linux
RAM 1 GB
Mimedefang,Clamav, Spamassassin , vipul Razor , openwebmail
2 SCSI Disks

 Mailing clients are increasing not too fast. Should the above is enough or
i should another Processor and more RAM

 Plz comment and recommend

Regards

Muhammad Talha