Domain Name Servers (DNS):
18.104.22.168 (Primary IPv4)
22.214.171.124 (Secondary IPv4)
Outgoing mailserver (SMTP):
Xfiber offers addon services like DNS, SMT, self-service and monitoring services for clients with communication products from Xfiber. These services are operational 24/7, but may without notice be taken down for scheduled maintenance. This will be performed within our ordinary maintenance window, any other maintenance will be notified.
Our DNS and SMTP services have redundancy, and maintenance will – as far as possible – be done without interruption for our customers.
Outgoing email service for customers with Internet access from Xfiber. Access to the service requires official IP addresses assigned to the customer from Xfiber. The service can be accessed at smtp.xfiber.com on port 25, and can be used both with and without encryption (SSLv2 / SSLv3 / TLS).
It’s set a limit of 100 connections per IP per 30 minutes, with 25 messages per session. The maximum size of e-mail (including attachments) is 100MB.
Abuse of service could lead to the removal of access.
Please contact us for more information, if you are a customer with IP transit requiring SMTP service. We recommend mailchimp.com for larger amounts of mail (advertising / newsletters).
Recursive DNS lookup server for customers with Internet access from Xfiber. Access to the service requires official IP addresses assigned to the customer from Xfiber. It is not allowed to set up open relay to the Internet that forwards requests to our recursive DNS servers.