ESMTP Server Directory

An ESMTP Server Directory provides user authentication and recipient validation using the features in extended SMTP.

1. On the page Settings > Users > User Directories, click Add.
   The Add User Directory page displays.
2. In the text field User directory name, enter a name for the user directory.
3. From the pull-down menu User directory type, select ESMTP.
   The User Directory Properties section displays with options for ESMTP Server Directory.
4. Determine your desired email verification method; from Email verification method, select Use the return status of the VRFY command or Use the return status of the RCPT command:
   • Selection of Use the return status of the VRFY command verifies the email user name.
   • Selection of Use the return status of the RCPT command verifies the email recipient.
5. In the text field Sender email address, enter an email address for the user directory.
6. In the text field Cache timeout, enter a value in minutes.

   The cache timeout is the amount of time that a valid address remains in the memory cache. If an email message is sent from a previously validated address during this timeout period, the email is delivered without contacting the validation server. However, if another message is sent from this address after the timeout has expired, the server will be contacted to validate the address. Default value is 60 minutes.

   Remove all addresses from the cache by clicking Clear cache.

7. Click OK.

   The settings are saved.