The same question has been asked many times in the forum..... only fixed by a moderator adjusting the account(s).

Why is this not a default bug fix on all accounts? Why does subscribers need to source out answers on the web and then ask you to "adjust their account" to perform in a way that is resonably expected? 

I can receive emails with more than 10 attachments, but cannot forward or reply. There also seems to be a restriction on total size of attachments. I have received the same error even when I am attaching less than 10 attachments.