I have setup email service for my domain and including the auto generated emails cannot receive emails, also I keep getting wrong username and password when I try to login remotely to my domain email address.
Could you please specify when you have set up the email addresses and if you are still experiencing the issue with mail delivery? If they were set up today, then they may not be able to receive email since the settings haven't been propagated yet.
Regarding the login issue, please make sure that you enter the correct login details. If you are sure that the details entered are valid, please let us know and we will investigate the matter further.
Please let us know if you have any questions. You can always contact us here: https://www.dynadot.com/community/about/contact.html .