Dns servers:

dns.smarthost.eu (91.211.220.10)
dns2.smarthost.eu (193.93.88.10)
dns3.smarthost.eu (94.23.189.130)

Mail configuration:

Outgoing/incoming e-mail server is your main/technical domain or any of your additional domains on your hosting account.

You can use: 
customer-domain.smarthost.eu
or
customer-domain.eu
(advice: "customer-domain" is your domain).

Webmail access:
CUSTOMER-DOMAIN.smarthost.eu/webmail

Technical support 24h: helpdesk.smarthost.eu