WriteRFCStrings is a procedure used to write the TStrings values in AStrings on the connection in a format consistent with RFC message responses. WriteRFCStrings insures that individual lines in AStrings beginning with the response termination character '.' are converted to '..', and call
WriteLn using the updated values. When all lines have been written, WriteRFCStrings calls
WriteLn to send the '.' termination character to indicate the end of RFC response messages.