Maileon for TeamLeader provides 2-way synchronization between Maileon and TeamLeader.
...
With this option enabled a double opt-in process will be started for each contact that is created in your HubSpot TeamLeader account.
Double Opt-in Process Plus
...
If you want to customize the DOI mailing that will be sent from Maileon you can input the key of the mailing here. Only available if the DOI process is enabled. Do NOT leave this field empty if your Maileon account has no default DOI mailing set!
Contact Permission
If you want to just create Maileon contacts with a set permission you can select it here. Only available if the DOI process is disabled.
...
If you want Maileon to publish relevant changes to your HubSpot TeamLeader contacts you should configure Maileon webhooks. You can find the Webhook URLs in the Maileon Settings section.
...