Having a period in the email address or the name is not a limitation of Constant Contact, you are able to upload contacts with a period. To properly track your request, are you able to clarify exactly what you're seeing? Where do you see this error and what does it say?
Since we have not heard from you in a couple of months, we are closing this out. If you are still having an issue, please create a new post or contact our Support Team.
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