ipad mail issues

It looks like my e-mail is sending duplicates, when actually only one response has been sent. This started happening after the last update, with the new email format.

i have deleted my email, and then set it up again, but it's still happening.

Apple says it's my Shaw service provider and Shaw says it's an Apple issue.

Also, sometimes the email won't send, and sometimes it takes time to have the emails download from the server.

Can anyone help?