Ad 1. Here is a reply I got from inbox.com's support:
Quote:
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Account will be completely removed from our systems after 3 months of the last login to the account or after 2 months following account registration if there have been no logins to the account. Removing account includes removal of all messages, attachments and stored data.
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Ad 2. I see no problem here, as (a) there is no way to determine whether messages come from another account of yours (b) there are various spam filter options, including 'no filter' and 'accept only from approved addresses'.