I solved all my problems that needed disposable email addresses quite simply: I just don't sign up for those sites. If I'm not interested in getting future emails from them, I probably don't care enough to even log in.
I wonder how effective it would be to look up the MX record of each domain (or just the A record, as it looks like all of mailinator's alternate domains have MX records that just point to their own A records) and ban based on the IP address? You'd have to update periodically, I suppose, but all of mailinator's alternate domains resolve to the same IP address. Of course it seems to be a moot point nowadays.
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