If you'd like to prevent emails from being sent to specific people, you can add domains and email addresses to your blacklist. Each user has their own personal blacklist they can edit. There's also a team blacklist that only the account owner and managers can edit.
To add multiple domains and email addresses, you can separate each one by adding a new line.
You can also blacklist contacts within a sequence by changing their status to blacklist. Blacklisting the contact within a sequence will blacklist all contacts with that domain. To remove the contact from being blacklisted within the sequence, you'll need to navigate to your safety settings and remove the domain.
Note: Make sure to check that both your email provider's blacklist and your Interseller blacklist include the same emails and domains. This will help ensure that Interseller won't send any emails to the blacklisted email addresses and domains on both lists.