php-imap extension

I'm trying to install v-webmail on my server but before that I need php-imap extension to be installed on my server.

The server is running under Redhat Linux 8 with cPanel,

After I downloaded php-mysql-4.2.2-8.0.5.i386.rpm and type "rpm -i php-mysql-4.2.2-8.0.5.i386.rpm", I found the following error,

Error:

warning: php-4.2.2-8.0.5.src.rpm: V3 DSA signature: NOKEY, key ID db42a60e

Can anyone help me? Many Thx!!!!

 

 

 

 

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