By default, the open relay option for the mail server is disabled in Parallels Plesk Panel.
It is not recommend to enabe this option because an open relay can make it possible for an unscrupulous senders to route large volumes of spam.
You can enable it by using the root.controls.lock file located in PRODUCT_DATA_D\var directory.
To enable open relay, follow these steps:
1. Open the root.controls.lock file.
2. Remove the /server/mail.php3:relay_open line and save the file.
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