Getting a 403 (or other) error when you are trying to save a new campaign in Sendy? This might be the problem.
Yesterday I was building a newsletter for a client, I added the HTML code to the Sendy cod box on the right and the palin text version to the box in the left, then upon hitting "Save & Next" button I was getting a big fat 403 error page.
Initially I assumed it was server problem, but eventually discovered I'd added some links to the email code but not added a URL.
So in the HTML code it looked like this...
<a href="">Text for link here</a>
The HTML code section of sendy didn't seem to mind this, but the plain text version did.
So if you get this issue, you know what to check!