Delivery failure to one domain: “550 5.6.0 Lone CR or LF in body (see RFC2822 section 2.3)” I have not had this issue with any other addresses only one. I called them o see what is happening. Apparently there is an Outlook issue with the TAG CRLF. If there is no are no matching LF for all CR and vice versa that is considered a bad email. The CR or LF are searched in the header and in the body. I was told that 7.0.3 has the answer to the problem but I do not see this issue fixed. Has anyone else have this problem?