Antispam and email aliases

Email aliases cannot be used to log in to the webmail interface. For this reason, it is necessary to set up antispam rules in the Mailbox Administration, which is available after logging in to webmail using a postmaster account or a privileged account.
After logging in to the webmail, click on Admin in the top menu.

In the left menu, click Alias, select the appropriate alias, and then click the EDIT button at the top right.
Set antispam, blocked and secure addresses for the alias and save by clicking SAVE.