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This can happen if there is something wrong with the email assets itself, or something goes wrong on the back end. I haven't heard of any email issues today though, so I would recommend opening a support case to have one of our engineers take a look at the email for you. Please provide the name of the campaign and email, as well as links to both in the case.
Thank you for your help!
I had a similar experience with a newsletter send a few weeks ago. Come to find out I had inadvertently left the default email in the reply-to field when I added the lead owner token. The program read that as two reply-to emails and the servers rejected the email even thought it looked as though the program sent it.
This issue wasn't caught when I sent sample emails out.