Rick;
You are welcome. Glad to help.
Getting a DKIM TXT record correct can be difficult. DNS TXT records can hold anything, I've heard reports of small video clips, but the thing that trips people up is that strings can only be 255 long characters, max payload 65,535 characters (IETF RFC 1035), so you have to break your record into several strings, it's the calling client's responsibility to concatenate the strings.
Lt. Col. Marshall E. Giguere
New Hampshire Wing, Director of IT
Civil Air Patrol, U.S. Air Force Auxiliary
GoCivilAirPatrol.com
nhwg.cap.gov

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