Having a custom email for your website makes it look professional. You can setup your custom email to synchronize with your personal gmail, hotmail or yahoo mail account so that a copy of every email that comes into the custom email will be forwarded to your gmail or hotmail address. Also you can reply any of those emails through your gmail or hotmail address and the receiver will see it as though you sent it through your custom email address. Most clients prefer to write to you through a custom email. When they don't see one, they may conclude that your site is not professional.

Also most times, you might be finding it difficult to login to your webmail account to check mails sent to your custom email address, but once you setup your gmail properly, there will not be any need to login to your webmail to check your mails because a copy of all the mails from the custom email will be sent to your gmail address. These are some of the advantages of setting up a custom email for your site domain name.
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A custom email is an email you create which has your site domain name as part of the email address. For example, one of the custom email of microsofttut.com is: tutorjoseph@microsofttut.com. Most domain registrars allow you to create up to 2 custom emails for each domain name you register with them.

This tutorial post gives you a step by step guide to create a custom email, how to add a forwarding email and how to setup your custom email so that you can send and receive email through your gmail or hotmail account on behalf of your custom email address.

NOTE:
Before you continue with this tutorial, make sure that you have created a gmail account and that you have a custom domain name for your site or blog. Also make sure that your domain registrar or web hosting company allows you to create a custom email with your domain names. Most hosting companies like domainking, bluehost, hostgator, godaddy do.
Let's get Started!

How To Create A Custom Email
1. Login to your domain registrar's or web hosting company's cPanel. Under the Email section, click on Email Accounts.
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2. Next is to select the domain name you want your email account to be associated with in the drop-down list (if you have more than one domain name registered). Then enter email name of your choice and a strong password of your choice. Set your Mailbox Quota. You can choose unlimited. Then click on Create Account as shown in the screenshot below.
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Congrats! you just created a custom email for your site domain name. There are some configuration details you need to fetch before you can setup your gmail to receive and send mails on behalf of your custom email.

NOTE:
Some domain registrars or web hosting companies send the configuration details to the email you used to sign up with them. So you can check your email to see if it was sent to you. You can skip steps 4 to 6 if it was sent to your email.

4. Again, log in to your cPanel. Click on Email Accounts in the Email section.

5. Next, click on the Configure / Set Up Mail Client icon as shown in the screenshot below.
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Click https://www.microsofttut.com/2018/05/how-to-set-up-your-custom-email-to-send-and-receive-mail-through-gmail.html to study full tutorial post with step by step screenshot.