I knew from the wiki that FAS users get only email alias with no storage as mentioned below:
You will not be provided with any sort of POP, IMAP, or web-based email access. You will not be provided with any mail storage. These aliases are forwarding-only . In order to send mail ‘from’ these addresses, you must set the
Fromheader on your email from your current email client. Many free web-based email services do not offer this ability, so you may need to establish an account elsewhere to gain this ability. The necessary configuration steps vary for each email client, so you are on your own to figure out how to do this.
Is there a possibility to get a mail storage? I know there are opensource mail providers but that isn’t my choice.
In case the answer is no, is there a linux distro which offers it other than ubuntu ?