Delivering emails inside the client's primary inbox is a hard task as it relies upon various elements, including maintaining a good server reputation and you can use ZeroBounce to help you.
ZeroBounce is an email validation service that is committed to e-mail bounce detection, email abuse, and spam trap detection. It is used to increase the deliverability rates of your emails.
To maintain your server reputation it is important to send good quality emails to your client and keep your bounce rate as low as possible. To reduce the chances of bounced emails, Groundhogg provides double opt-in forms and email statuses based on a user's preferences for emails.
Validating Email Addresses
Email addresses will be automatically validated as contacts are added, so over time, your entire list will be validated.
Groundhogg will only validate Unconfirmed email addresses. All the other statuses require some kind of confirmation either by the contact or by the admin, so validating them is redundant.
If you want to re-validate your list, go to Tools > Misc and click Re-validate and that will force validate your whole list, even if the email had been previously revalidated.
At any time you can view the email Validation Report to see how the validation affected your list, and make any manual adjustments if you need to.
Fixing False Positives
Sometimes ZeroBounce gets it wrong. You can manually override the ZeroBounce status for a contact in their profile. To change the status, select Valid and then save the changes.