Hi I found a small bug in your summary e-mails:
the inline css color value sometimes ends with two semicolons instead of one
Popular Topics: color: #FFFFFF;;
New Posts: color: #006699;;
There are more headlines in each mail, but that’s probably easier for you to figure out.
#006699;; could even be removed completely, since this color is never used for those headlines anyhow.
(overwritten by another css rule in every case, I think)