Hi there,
I received a 406 error with both ckeditor or tynimce.
Just trying to put an external link (eg www.google.com) in the message body, save as draft, and error appear.
If editors plugins are disable, draft is saved, and all is fine.
@vz777 Possibly the server has some anti-malware software that doesn’t like the html content of the campaign. The usual suspects are apache modsecurity and wordpress wordfence plugin.
@duncanc Thanks for answer
I don’t use wp, maybe when I have more time I’ll have a look at modsecurity, but I don’t remember configuring anything special on that side.