If you are using SendGrid with Mailster you can also automatically progress bounces. You only need
- the SendGrid Integration plugin from the WordPress Repo
- your SendGrid account
On the delivery tab you can find two options for handling bounces
Select SendGrid and future bounced email addresses will automatically get marked as hard bounced.
If you select Mailster you have to contact the SendGrid Support and request to enable “preserve headers” option for your account. This step is required otherwise SendGrid will overwrite the return-path of your mails with their own.