The following servers can be used for SMTP Outgoing mail relay from your website (within our network):

Less than 100 Emails per day:
smtp.alentus.com
smtp.yourdomain.tld

Between 100-1000 Emails per day:
smtp01.zabco.net

We do not recommend sending more than 1000 Emails per day since it may slow down our mail servers.
If we find that your domain is bottlenecking the performance of our outgoing email server, we will block the domain from sending.

Please note that this service is only available for email scripts sending from your website.

If you need to send email from your workstation or Outlook client, please refer to our SMTP-Auth service:
http://support.alentus.com/KB/a165/alentus-smtp-auth-information.aspx?KBSearchID=256