dalacor, I wasn’t asking Manager to create any HTML code. Rather as you suggested with Notepad++, I have been using my own text/html editor to create the code and then I just drop it into the “Message Body” box in Manager.
I have carefully gone through and reconstructed all my code and tested it by sending the email from a PHP page. At that point is was working perfectly. I then transferred the code to Manager. As the box was only for the “Message Body”, I had to cut off the HTML declaration, the and the tags. Presumably Manager puts that stuff in itself, but that’s where it buggers it up. In Manager, the email won’t centre on the page and the width is uncontrolled.
I’ve also found that Manager does something with the ability to send a copy of the email to yourself. I’m still not sure what it’s doing but while I was trying to get the formatting of the content to my satisfaction, the CCs stopped working, started working, stopped again and finally started. The last time I got CC working was when I removed the characters “https://” from a part of the text (text, not a tag!). Hopefully, as long as I don’t touch a thing now, the CC will continue to work.