v3 api returns Email address is invalid for no apparent reason

[BrianD3870]

The API call to the endpoint https://api.cc.email/v3/contacts/sign_up_form returns "Email address is invalid" for most calls. Here are five example email addresses all rejected as "invalid" (both by my production application and also using the "test" feature of the API docs):

naomi.wongwui@diamondresorts.com
tylerader@yahoo.com
jtheodore@siebert.com
PAMELATJOHNSONPHR@GMAIL.COM
bapslansdale@gmail.com

[Caleb_A]

Thank you for reaching out to Constant Contact API Developer Support, my name is Caleb. My team is here to assist outside software developers with questions about building into Constant Contact's API.

The error message 'Invalid email address' is typically caused by our compliance system detecting multiple sign ups to several Constant Contact accounts from the email address that caused the error. I can confirm that all 5 of the listed examples have been detected as having signed up to multiple accounts in a short time causing the system to block sign ups from these addresses.

If you have further questions about these error messages please feel free to reach out to our Account Review department and they would be happy to answer any concerns you may have.

Contact an Account Review Specialist:
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/5782-contact-an-account-review-and-...

[IT-Admin]

This answers why it happens but we need to know how to fix this. We are ending up with 10 to 15 clients over the past 2 months who are not on our mailing list because of this error.

How do we, or Constant Contact fix this?

[John__B]

Hello IT-Admin,

Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.

I’m sorry to hear that you’ve been running into this error. If you’d like to provide us with example contacts who have run into this error when being added to your account, we would be happy to investigate and confirm the reason for the error. You can reach out to us directly with this information at webservices@constantcontact.com.

I would also mention that our engineering teams are currently working to improve the overall experience with our compliance system check when adding contacts. 

Please let us know if you have any other questions!

Regards,