Maybe its your outgoing mail server that is messing things up. How about testing using an external smtp server or CRDMail?

Hi Tina,

Well, I tested with CRDMail (it sometimes gives me error, saying that the email couldn't be sent) and also tested with an external SMTP, and it gave me the same result!

I'm going to contact technical support because I have no idea what else to do!

Thanks for your help,
Irene

We have made changes to the process of embedding which should resolve the issue for web clients. The changes will be released tomorrow.