This is one of the very important parts of your domain. You are likely going to benefit by using your domain?s email? for your communication with other people. Having a dedicated email address with your domain will also protect you in the event that your email provider was to do anything you didn’t agree upon, and would want to change. With an email address, you can choose to have the host? support your email address, or you could set to forward to another email address. Keep in mind that if you are using webmail, you may not be able to setup the email address to show as your domain’s email address as the person writing to you. For example, you can not change the send mail as in Gmail, but you could set a reply-to address to be different. This will mean that the person you are writing to may likely send their email to your to your Gmail address, and not your domain’s email address.
When using your email client, and assuming your want your email to forward to your other email provider, then this will be a little tricky, but it can work. Set the IMAP server to be your email provider’s account. You would then set the SMTP server from your host as the SMTP server, and you may have to provide an authentication for sending through the host’s SMTP server. This is required by many hosts to reduce the amount of SPAM that goes through their servers. You would also want to make sure you set your email address to forward to your email provider.