Hello user636310,
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.
Contacts that bounce as Non-Existent email addresses in response to an email send will still be active/subscribed and visible within the Contacts tab of the UI, as well as searchable via the API as active contacts unless they have been deleted by someone who manages your account. If an email could not be delivered to that address, it does not mean that they will be unsubscribed.
Managing, removing, and preventing bounced emails
http://knowledgebase.constantcontact.com/articles/KnowledgeBase/5288-understanding-managing-and-removing-bounces
As far as your unsubscribed contacts being out of sync between Constant Contact and your CRM, that would be caused by other factors that are unrelated to bounces. However, if you're still having an issue with this, please feel free to reach out to us directly by email with the case number listed at the end of this post.
Currently we offer two ways to determine which contacts have bounced. You can search by campaign, to see a list of bounced contacts and the reason for the bounce (ex: non-existent), or you can search by individual contact. I'll list those endpoints for you below.
Use the V3 API to Retrieve Bounces by Campaign :
First, retrieve the "campaign_id" for campaign(s) with current_status": "Done".
GET a Collection of Email Campaigns https://developer.constantcontact.com/api_reference/index.html#!/Email_Campaigns/retrieveEmailCampaignsUsingGET
Next, use the "campaign_id" to get the "campaign_activity_id" for the "role": "primary_email".
GET Details About a Single Email Campaign
https://developer.constantcontact.com/api_reference/index.html#!/Email_Campaigns/retrieveEmailCampaignUsingGET
Next, use the "campaign_id" to retrieve the contacts who bounced for that campaign, and why they bounced.
GET an Email Bounces Report (bounce key in right column, you can narrow by type as well)
https://developer.constantcontact.com/api_reference/index.html#!/Email_Reporting/getBounces
Use the V3 API to Retrieve bounces by contact:
First, get the Contact "contact_id"(s) for the contact or group of contacts that you'll be checking for bounces.
GET Contacts Collection
https://developer.constantcontact.com/api_reference/index.html#!/Contacts/getContacts
Next, use the "contact_id" and the tracking_activities_list parameter "em_bounces" to see which sent campaigns the contact was bounced from. This will not show you the bounce reason, but will list the "campaign_activity_id" which can be used as outlined above to obtain more detail.
GET Contact Activity Details
https://developer.constantcontact.com/api_reference/index.html#!/Contacts_Reporting/getContactTracking
We'd be happy to look further into your unsubscribed contacts being out of sync between Constant Contact and your CRM, and/or the contacts that you were having difficulty locating within the system that had previously bounced as non-existant..
Please feel free to email our team directly at webservices@constantcontact.com with the email addresses in question, and/or any additional details about the discrepancies you were experiencing and reference case #30197488.
Please have a look and let us know if you have any other questions!
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