Forwarded emails do contain information that is likely true or false. If the forwarded email comes from a known person and does not contain a frantic or unusual message, it might be true.
Forwarded emails that contain different subject matter and content, an unbelievable offer especially to do with money or a virus warning may likely be false. For example, any email claiming that the receiver had won a huge amount of lottery money or has an unclaimed inheritance might likely be false. Online fraud or phishing is common these days since spammers know various ways to gain access to other people's emails. A forwarded email with the email addresses of many people makes it easy for spammers to create their own email content and send them as forwarded email to the addresses concerned.