Firewall Information
DirectMX connects directly to your mail server for a variety of reasons. You may need to configure your firewall so that DirectMX has access to do so. Here are a list of IP Addresses and port numbers that DirectMX uses.
Inbound and Outbound Filtering
All DirectMX services should be configured as two-way, meaning that we can contact you from these IP addresses and ports, and your server should be able to contact us on these IP addresses and ports. This facilitates both the inbound receipt and delivery of email, as well as your outbound or smarthosting configuration.IP Addresses
All DirectMX services reside on the following IP ranges:
IPv4 - 64.111.17.16/27
IPv6 - 2607:2800:102:203::/64
Port Numbers
DirectMX will only ever connect to your equipment using TCP.
| Port | Required? | Role |
|---|---|---|
| 25 | Required | SMTP Mail delivery & recipient verification |
| 587 | optional | Secure SMTP Mail delivery |
| 389 | optional | LDAP recipient verification & authentication |
| 636 | optional | Secure LDAP recipient verification & authentication |
| 143 | optional | IMAP-based recipient verification & authentication |
| 110 | optional | POP-based recipient verification & authentication |
