I’m running V3.6.6. PHPlist has been running fine for me for several years. I last successfully sent out a newsletter about two months ago, so the problem has arisen since then.
If I create a new campaign, then paste the same kind of html content that I have always used into the newsletter, then save it, I get a 403 error. If I hand-create simple html content (just plain text, with H1 and P tags only, nothing else), it saves without an error. If I add an IMG tag to this simple html code, with a known-to-exist image in a folder on the same host, I get the 403 error again. This is 100% repeatable behaviour.
Note that I have today created new installations of both V3.6.6 and V3.6.4 on my own personal web space, on a different web hosting company, and I am getting the same 403 errors in the same circumstances as my original installation. This makes me think that something has changed at the web hosts (but two different companies, although they’re both cpanel, so are probably pretty much the same), and this change is blocking something for some kind of real or perceived security issue. However, I’m at a loss to know where to look.
Can anyone offer any suggestions?