Firewall & Spam Protection

If your mail is delivered to our mail system for spam filtering before being forwarded to your mail server you can lock down your firewall to only accept inbound mail from our system. This eliminates spam attempting to deliver directly to your server.

Firewall Settings

Lock down your firewall to only accept inbound connections on port 25 from the following Xtreme address ranges:

IP Addresses (Subnet Mask (Subnet Mask


MX Records And Settings

You will also need to have an MX record pointing to your sending IP address. Some mail servers will do a test to check the sending mail server does if fact have an MX record pointer for the sending domain.

MX Records MX preference = 10, mail exchanger = MX preference = 20, mail exchanger =


If you wish to foward mail though Xtreme, please forward to NOT