How to add an unsubscribe link when using a 3rd party mail client?

[temp89]

I'm aware of 

https://knowledge.hubspot.com/email/how-to-send-contacts-an-email-with-an-opt-out-link-so-they-can-m...

and how Hubspot can add an unsubscribe link to your sig, but this only functions for emails sent from within Hubspot.

We use a 3rd party mail client to contact our customers that sends info to Hubspot via a BCC link. Is there a way to generate a customer unsubscribe link using some kind of formula or generic link?

[danmoyle · Accepted solution]

Hi @temp89. Whichever third party system you're using should have the answer as to whether you can add an unsubscribe link. If there's an integration to HubSpot which passes data into your CRM, you should be able to track that. Otherwise, managing subscriptions happens inside of HubSpot with HubSpot hosted communications. That's how I understand the system as a user myself.