Aruba.it GigaMail, € 5.00/yr. on Linux Emails

The GigaMail service allows you to increase the capacity of your @yourdomain.com account, going from 1GB up to 25GB.
You can add up to 5 GigaMail (each with 5GB of storage space), to each account, to reach a maximum capacity of 25GB, but there’s no limit to the number of GigaMails you can purchase per domain.

Up to 25GB of storage space
Receive big attachments
Email control panel
Free support 24/7

The GigaMail service, compared with the standard 1GB accounts, makes for easier management of large quantities of messages and delivery of big attachments.

Following activation, you can choose which accounts to expand expand and how many GBs to give to each account.
The additional space provided by each GigaMail can’t be split: meaning you can associate one or more 5GB GigaMail with your accounts, but you can’t split up a GigaMail among multiple accounts.
From the email control panel available at http://webmail.aruba.it, you can disable the service and transfer it from one account to another related to the same domain, making sure you don’t set a smaller amount of storage space than the amount of space occupied by the account.

GigaMail is an additional service associated with a domain, therefore it expires with said domain, even if purchased at a later date.