The best way is to receive the emails directly in your Fastmail account. No forwarding is required, and you will be able to respond with From of your Prosaben email address. Forwarding (or sending email with a From address which is not associated with the email sending server) can in some cases cause messages to be treated as spam. Here are the requirements for you to use your own domain at your Fastmail account:
- You must have a Standard or Professional plan at Fastmail (or if you have an older account it must be Enhanced or greater). If you have a lower level plan you can upgrade to Standard.
- You must own (or have control over) your domain (prosaben.com).
- Instructions for setting up your domain for using Fastmail are at:
https://www.fastmail.com/help/receive/domains.html
I recommend using the Nameservers hosted with FastMail choice.
- Once you have this set up as recommended, everything involving your domain can be controlled by logging into your Fastmail account, including:
- Email: You will be able to send using any address you wish to use at your probasen.com domain. You will be able to receive using any address at your probasen.com domain. You can choose to only use certain addresses and block others. You can also choose to set up accounts for other people in your company to use email at your domain.
- Websites: You can set up simple basic websites at your domain. You can also set up photo galleries.
- Cloud data storage: You can set up websites associated with your domain which can be used to upload and/or download data files. You can set up a password so only certain people can access that file storage location.
I use Fastmail in this manner, so that I can use email directly with my own domain email address, have a website at my domain, and use cloud storage at my domain. This works very well and is very reliable.
Bill