Problem with mail forwarding and attachment download

I have a problem with the emClient program. I cannot download attachments from the mail. I have a message “The attachment cannot be downloaded”. I also have a problem with the reply to the e-mail. I am attaching the screenshots of the errors.

If you eg" dblclick" and eg" IMAP / Exchange / iCloud acct attachment the first time you read an email message “depending on the size of the attachment” sometimes you can get that message as it’s not all cached yet.

So to avoid that happening, “hover your mouse over the attachment” and then click “open” button. Doing it this way forces the attachment to d/l completely to the end and then open ok.