I have users that were able to BCC themselves no problem when they were on a domain with SBS2011 and exchange 2010. They have since been moved from that domain to a new domain and now users cannon BCC themselves. They get an error:
Delivery has failed to these recipients or groups:
User Name <mailto:IMCEAEX-_O%3DFIRST%2B20ORGANIZATION_OU%3DEXCHANGE%2B20ADMINISTRATIVE%2B20GROUP%2B20%2B28FYDIBOHF23SPDLT%2B29_CN%3DRECIPIENTS_CN%3Duser%2B20name969@domain.com>
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk.
I replaced their first name with user and last with name.
Any ideas on where to start looking?