Digital Signature problems?

[Max Kipness]

Hello,

We have a client that has started sending us emails with digital
signatures as of late. It seems we are having a problem opening up the
email as it is stating: The digital signature on this message is invalid
or not trusted. 

They send these emails to many clients and stating that maybe our virus
scanner is stripping the id attachment.

I don't know of any reason why MailScanner would be doing this, but
thought I would run it past the list.

Has anybody had an issue with this?

Thanks,
Max

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