forwarding multiple emails

I am unable to forward to more than two people at a time. This is the message I get:
An unknown error has occurred. Subject ‘Fw: Cell Phone vs. Bible’, Account: ‘pop.joimail.com’, Server: ‘smtpauth.earthlink.net’, Protocol: SMTP, Server Response: ‘550 Your message does not conform to RFC2822 standard’, Port: 587, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC69s
I could use help. Thanks

Did you Google RFC2822 or 0x800CCC69s and the same for avast board?