syntex for regex trailing email

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I am not really sure how this is happing but for some reason, I am now getting 404 errors for pages but the pages ultimately exist but have been appended with a trailing company default email address.

The problem is that most post pages have for some reason a trailing email address example: http://www.somepage.com/apage/anemail@email.com needs to be rewritten to http://www.somepage.com/apage/

I suspect there is a way to through regex to capture and to rewrite but I don’t know how. Does anyone have experience with this problem? OR know how to prevent it in the first place