Summary:
How do I enable SMTP Recipient Filtering with my Plesk server to perform recipient verification/validation?

By default Plesk does not validate e-mail recipients during the SMTP transaction; rather Plesk will accept all incoming e-mail, process them and return a Non Delivery Report (NDR) for undeliverable e-mail.

Plesk offers configuration options to:

• Change the default rejection notice
• Forward undeliverable e-mail to a catch-all email address
• Reject undeliverable e-mail without accepting it

Best practice is to "Reject undeliverable e-mail" otherwise known as "SMTP Recipient Filtering". This verification option allows PerfectMail to automatically detect and record valid e-mail addresses on your Plesk e-mail server. It also prevents the creation of E-mail Backscatter.

To configure SMTP Recipient Filtering for your Plesk server, perform the following:

1. Click the Domains shortcut in the navigation pane.
2. Click the required domain name in the list.
3. Click Mail.
4. Click Preferences.
5. Choose a desired option ("Reject undeliverable e-mail") and specify the information as required.
6. Click OK.