This is the mail system at host c1mailgw12.amadis.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system : host m2w-in1.ctmail.com[209.67.128.24] said: 550 5.1.1 is not a valid mailbox (in reply to RCPT TO command) : host m2w-in1.ctmail.com[209.67.128.24] said: 550 5.1.1 is not a valid mailbox (in reply to RCPT TO command) : host m2w-in1.ctmail.com[209.67.128.24] said: 550 5.1.1 is not a valid mailbox (in reply to RCPT TO command)