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Tom Bush might as well email me so we can work on it. It's gonna be something outside the usual case to be sure.
IP issues?Doubtful. Changing your IP address will not invalidate or hijack someone else's cookie -- unless you (not Marketo) are using a misconfigured web proxy that does not vary responses based on the cookie. Such mistakes can be catastrophic for authenticated sites but can have similar effects ...
If the user self-associates by clicking a tracked link, you don't need any custom anything.
The Munchkin cookie isn't appropriate as a GA User ID. It's far better to use the Marketo Lead ID unless it is definitively unavailable (as will soon be the case w/Anonymous Marketo leads). The definition of a GA User ID is that it be non-personally-identifiable and tied to a single human user.
The list is missing .MILL. That was probably a typo, but more important, there aren't enough exclusions. Needs to at least cover a-z0-9+=@,Consider:john.mil@example.comjohn.mil+retail@example.comjohn.doe@example.mil.newsenfa.mil=joe@example.comAll perf'ly valid addresses w/common formats.And there...
When it's required/desirable to persist custom field values I like to use pending leads (as distinguished from both anonymous and named leads).Pending leads use the Munchkin cookie as the synthetic email address, together with a boolean that signifies that they are in the special area between anon a...