SMTP Errors 0x800CCC78 and 0x800CCC79: Outlook Cannot Send, Server Rejects Address
Outlook 0x800CCC78 means the SMTP server rejected your sender or recipient address. Fix the reply-to address, SMTP auth and relay permissions.
Outlook 0x800CCC78 means the SMTP server rejected your sender or recipient address. Fix the reply-to address, SMTP auth and relay permissions.