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> have you seen any interesting solutions around greylisting in the wild?

To "bypass" or somehow defeat greylisting, you mean?

I'm not aware of any via workarounds, no. I would certainly be interested in hearing about any , though, since I use greylisting on mail servers with thousands of users.

In some cases, such as when using OpenBSD's spamd [0], you (an SMTP client) don't even get to talk to the "real" SMTP server until you've successfully "passed the tests". This is the primary implementation of greylisting that I use, FWIW.

[0]: http://man.openbsd.org/OpenBSD-current/man8/spamd.8

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