So you have a Gmail address and you have a domain address as well and you want to send your domain email address without the ” on behalf of ” message that recipients see when sending emails through Gmail.
Gmail does allow you to use your own domain to send messages but it means delving into the settings in Gmail.
Open the settings section in Gmail which is in the top right hand side of Gmail
Now you will see you email addresses in the Send mail as section
You will need to contact your domain host to get the correct SMTP server information and explain to them what you are trying to do.
This information will vary depending on your domain name host
You will have a choice of 3 ports to use , choose the one that works for you, and enter your domain password ( not your Gmail password) as your emails are being relayed through your domain host.
Once you have clicked on save changes it will test what you have entered and if it is incorrect will give you a message that it is taking Gmail too long to respond or that the user name /password is incorrect. That means you have not entered the correct information.