Thank you for reaching out to us. I can understand that it is important to ensure that your contacts are not receiving your Welcome email twice. To better investigate what has happened, there is some information that we would need that will be extremely helpful:
1) The email address of the contact who received more than one Welcome email
2) A forwarded message of both emails received by the contact. If you cannot forward the message, a screenshot would also be helpful. If you do send a screenshot of the emails, please keep in mind that the screenshots need to contain the detailed information for those emails (From, Reply-to, Subject).
You can email this information to social_support(at)constantcontact(dot)com, with a reference to this post. Please feel free to send us any additional information that you believe could be useful for us.
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