PopPlaceholder was updated in 2014? Everything on my system is new how would I get old MCC. Does SimpleMail instal that. From reading it does not look like it does.
Sorry, my mistake, PopPlaceholder is older. But even though you may have a brand new shiny install of OS4, the latest versions of things might not be a part of OS4. The Contributions drawer, for instance, includes some very old software. Whoever compiled the OS4 disc image may have missed the latest versions of the MCCs. Check the ones on your system (MUI:Libs/mui) against the versions of Aminet. Update if necessary.
MUI itself was updated less than a month ago. Do you have that version installed?
Try the 68K version of SimpleMail as well. It will run under OS4. Maybe it will work better for you.
IMAP has been on the to-do list for YAM for several years. I know it's not an option for you now, but it could be eventually.
I know you're frustrated that something as "basic" as email is proving difficult. In most markets, what you say would be perfectly logical: there's a market need for an email client, someone creates a product, people buy that product, everyone is happy. But this is not a normal market. No one can make a full-time living writing Amiga software. Things must be done in people's spare time, so things move very slowly. We're trying to help you find a solution, but if the only info you can give us is "It's broken, I'll pay money for a working program" there's not much we can do.
Please explain the problem(s) you are having with SimpleMail in great detail. Tell us the exact wording of any error messages you receive. Screenshots would be a big help.