When your sales email address is dedicated for customer engagement and contact generation, receiving malicious and promotional emails from undesirable sources could prove to be a problem. Similarly, you may also want to avoid the creation of contacts from emails that belong to your organization. Domain exclusion allows you to prune the list of emails that are received in your sales inbox and helps refine the quality of contacts that are generated.
To define email domains that need to be excluded from contact creation,
Login to the web application as an Administrator.
Go to Admin Settings > Incoming Email
Under Excluded domains, type the domains that you’d like to stop receiving emails from such as @example.com and hit return or the enter key.
Note: Your email client’s domain is excluded by default to avoid fetching emails from your peers and adding them as contacts.
You can learn about capturing contacts via email in “How to convert your sales emails into contacts”