One of my servers is blocking mail from my other server

[midstate]

I am getting the following message when trying to send from one server (with MagicSpam) to another server (Also with MagicSpam). Whitelisting isn't helping. This IP is not listed on SpamRats, nor any other blacklist I can find. Regardless, we do NOT send out spam, and I'm certainly not paying to block myself.
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This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[EMAIL ADDRESS REDACTED]
host xxxxxxxxxxx.com [209.126.106.6]
SMTP error from remote mail server after RCPT TO:<[EMAIL ADDRESS REDACTED]>:
550-5.5.1 Server IP 209.126.108.19 listed as abusive. See
550-http://spamauditor.org/best-practices/ip-reputation/ for more information.
550 Protection provided by MagicSpam 2.1-5.3 http://www.magicspam.com
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Please advise on how to fix this.

Thank you.

Corey

[magicspam]

Hello Corey,

Thank you for your post.

From your rejection message we see that the message from 209.126.108.19 was rejected due to being listed on BMS/RBL list.

Checking on http://www.linuxmagic.com/products/bms/lookup link posted on the:

http://spamauditor.org/best-practices/ip-reputation/

tells us that the above mentioned IP is listed on:

MIPSpace-All
and
MIPSpace-Poor

May we suggest that you contact mipspace.com for delisting and further support.

We hope this information helps.