Cannot email a PDF document from Reader. Error Message.

Must have had some sort of update. As a result I an no longer email a pdf document from Adobe  Reader using my regular email account (I've ALWAYS been able to do this...until two days ago). When I Open the pdf document and click the "mail" icon I now get a window  (that is different than it's been the last few years) with a lot of options I don't want or need, I choose "attach to an email" and then  receive a pop up that says there's an error and to check my port settings (which have not changed). I'm having to save every document and then drag into my email. Whats going on? All my email client info is correct in my settings

Error Message Reads: Server Connection Error. Please verify that port 143 is available for connection on your machine or contact your administrator.

I've uninstalled and re-installed twice.

My port settings in my email account are unchanged.

All of my email POP and SMTP settings and passwords line up.

I have a MacBook Pro with Mojave 10.14 version

help!! Adobe chat guy kept telling me my "account had been canceled" but I am using the free version. Just need to be able to Read, Print, Open and attach a PDF to my Cox email account and send!