We send out html newsletters regularly with the dotnetnuke newsletter module. Until yesterday all mails were displayed fine at all recepients.

We have not changed anything about how we construct the newsletter. But with the newsletter we have sent out today the recepients that have outlook 2003 and most in browser emailclients don't display the html content anymore (if we select to view the source of the email the html content is fully there.) Outlook 2007 users have no problems. Once the mail is recieved in outlook 2007 and forwarded to an outlook 2003 client the mail displays fine aswell.

Has anyone encoutered this problem aswel or does anyone know what might be the cause of this. (outlook 2003 update?? I know 2003 renders like IE and 2007 renders like Word, but the problem only occured since today)

The last mailing we sent was wednesday and was fine in all email clients.
The content is a simple table with some links and images in it. and the only thing that changed from the last mailing are the links and the images, not the structure or tags or w/e

Thanks in advance for any pointers!