Most likely, there is no need to create a script for this. Try using the built-in mIRC command "/ignore" to set ignore private messages from users based on part of their address.

For example:
Quote
/ignore -p *@*post.cust*
/ignore -p *PwHRL*@*
/ignore -p *@*swisscom*

/ignore -l

Can read more details here: https://en.wikichip.org/wiki/mirc/commands/ignore

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