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Why does the X-axis on the marketing email count graph to up to 60? Is this where we've ended up, sending 60 emails to the same lead? Ouch.

It's someone opening or clicking emails 60 times (can happen!), not sending 60 marketing emails.

With Gmail and the like you only get to know about the first open.

I wonder if this is actually caused by the email being forwarded around to many people.

Email forwarding or just quirks of various email services and clients. Email clicks or website visits definitely a more reliable signal