I can access my mailbox (my terminal gives no error) but I no longer receive any emails.
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The domain name is suspended:
It may have expired or may be blocked due to a legal issue.
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The mailbox is full:
Standard mailboxes have 3 GB, Premium mailboxes 50 GB. Standard mailboxes can be upgraded to Premium mailboxes.
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The DNS configuration is incorrect:
Only MX records are used to receive messages; check that the domain uses Gandi's MX records (and only those).
Resizing a Gandi mailbox from Standard to Premium
Resetting a Gandi mailbox password
View the MX records needed to receive messages in your Gandi mailbox