Gmail – way to get all Gmail accounts with the recovery account

I would let one account handle the spam filtering for all of your accounts. I don't believe there are many benefits to having each account handle its own spam. I think Gmail is aware of the destination address of each incoming mail and having identical spam emails (with only the destination address changing) will strengthen the spam algorithm just as much as if it were single emails sent to multiple accounts.

Regardless of how much (more) it might improve the spam algorithm, you should choose the solution which best improves your workflow. I would just go with the first option (spam filter on the main account).

FYI: I use Gmail to process email from 12 accounts across 7 domains each with spam being primarily handled by my main Gmail account. :)

I don't use POP. I use forwarding (from Google apps to gmail) and think that I nail all 3 of your issues:

1. To:@domain.com filter tags them all [EDIT] - May not work for gmail->gmail
2. Never had any issues of the account expiring. Been doing this for at least 36months.
3. This happens for me, and I also use the send via SMTP feature so that the from address is not spoofed. 100% legitimate.