CenturyLink filters port 25 to reduce the spread of email viruses and spam (unsolicited email). Filtering port 25 has become the industry standard to reduce the spread of email viruses and spam. These email viruses allow malicious software to control infected computers. These viruses direct the infected machines to send email viruses and spam through port 25.
Port 25 filtering only applies to customers that have CenturyLink as their ISP. This tool will help you look up the contact information for a 3rd party ISP.
Customers with a dynamic IP address cannot turn off port 25 filtering.
If you have not leased static IP addresses from CenturyLink, or encounter another scenario with port 25, please chat with tech support.
If you have a residential account, such as an email address that ends in @q.com or @centurylink.net, order a static IP address through the static IP tool.
If you have a small business account, such as an email address that ends in @qwest.net or @qwestoffice.net, order a static IP address, order a static IP address using the account manager.
You may configure and start using your static IP address within one hour of ordering it from CenturyLink.