A mail server from siteground\\.com\\ was\\ hired,\\ and\\ when\\ configuring\\ the\\ outgoing\\ server\\ in\\ odoo,\\ it\\ shows\\ this\\ error\\.

The\\ test\\ recipient\\ \\(noreply@odoo.com) was rejected by the server with the error b'Sorry  The "MAIL FROM" [MAILS] email address you are using is\nnot hosted on this server. Tried to use as mail from [MAILS] address. Sending mails from addresses\nnot hosted on our server is not allowed. Please check the "MAIL FROM"\nsettings of your mail client and make sure you set the "MAIL FROM" address\nto an email account which is hosted on the server.'​

Any ideas?
Thanks!