Forwarding is the simplest: mail to info@ arrives in your Gmail, for instance. Each address costs £1.30 a month excl. VAT, up to ten addresses per domain.
A mailbox keeps your mail with us, 10 GB each, and you open it in any mail program. You send and receive from your own address. Each mailbox costs £3.10 a month excl. VAT. A domain has forwarding or mailboxes, not both.
Both run on one mail subscription per company, paid a year in advance, and work without a site too.
Your AI can read a mailbox for you, if you allow it yourself. It can then only read: it can't send, move or delete anything, and mail it reads stays unread.