Thank you for coming to the community with this information. We do always try to correct any glitches in our system that we can find, especially any that would be causing a contact to receive multiple emails. I just tested in my own account. I put myself on 3 different test lists, with both my work and home email address. I called them test 1, test 2, and test 3, and then scheduled an email to go out to all 3 test lists. I received two copies total. One at my work address, and one at my home address. If you have multiple different email addresses, like a work and a home address, then yes, you will get two emails. One email at each of those addresses, but the number of lists they are on should not effect how many emails they get, and didn't in my test.
I have personally never seen the glitch you're describing, and I'm not seeing a record of that issue in our historical logs. If something like that is happening though, we definitely want to get it fixed. If you can provide us an example of a single email address receiving multiple non-forwarded copies of a campaign, I will be happy to pass that information on to our Advanced Technical team so we can get it fixed. If you would like, I would gladly invite you to test it yourself as well.
Create a few test lists, with only one of your own email addresses in each of those test lists. The next time you send a campaign, include the test lists. If I'm right, then you'll still get only one copy. Two if you include the one sent by us stating "Your campaign has been sent". If I'm wrong, we'll have the information we need to track down the bug, and the only one who received duplicate emails will have been you, so no customers will have been impacted.
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