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I can't help you directly, probably, but it might help if you explained why you have so many domains, and whether they're just used for email.
Are mails to/from those domains all your own personal mail, or are we talking about websites (or something) that you manage on behalf of clients?
If the domains are also for hosted websites, do you use any of the webhosts to host mail for the domains? If you do, couldn't you forward mails that arrive on those systems to some other place (any other place?) for ease of collection?
Do SPF, DMARC etc make this all more complex than it seems?
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