Just wanted to save some frustration for others - I cut and pasted from a spreadsheet a list of emails, and got this error. Then I added commas to the list in the spreadsheet, same error. When I went to write an error report, I notices the table/column lines showed in the pasted information, so I went through the trouble of pasting into a To: email in my email and removed the one of the double commas that showed, copied, and repasted into Memberhub email list.
Voila! It worked and the email through memberhub went through.
Hope this helps, but it would be great if the software could somehow recognize or put a warning that if you cut/paste from a spreadsheet, it won't work because it sees a "table" only.
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