I am trying to switch to use Zoho instead of my own (currently broken) mail server for my domain. I have new mail being delivered to Zoho, but I was using Duocircle's MX Backup with my server and am trying to get Duocircle to deliver the backed up mail as well. I have configured Duocircle to deliver to mx.zoho.com:25, but when I tried to set the incoming gateway IP addresses on Zoho I received an "Error while processing" message.

I am including the list of Duocircle servers below. Thank you for helping with this.

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Delivery Servers

These IP's need to be in your firewall to ensure delivery from our network to your email server. 

Delivery Group 1 

pmta1.delivery1.ore.mailhop.org / 54.191.214.3

pmta1.delivery2.ore.mailhop.org / 54.149.210.130

pmta1.delivery3.ore.mailhop.org / 54.191.214.36

pmta1.delivery4.ore.mailhop.org / 54.191.151.194

pmta1.delivery5.ore.mailhop.org / 54.148.219.64

pmta1.delivery6.ore.mailhop.org / 54.149.206.185

pmta1.delivery7.ore.mailhop.org / 54.186.27.61

pmta1.delivery8.ore.mailhop.org / 54.191.158.99

pmta1.delivery9.ore.mailhop.org / 54.186.172.23

pmta1.delivery10.ore.mailhop.org / 54.149.36.10

Delivery Group 2 

pmta2.delivery1.ore.mailhop.org / 54.149.155.156

pmta2.delivery2.ore.mailhop.org / 54.69.130.42

pmta2.delivery3.ore.mailhop.org / 54.213.22.21

pmta2.delivery4.ore.mailhop.org / 54.200.247.200

pmta2.delivery5.ore.mailhop.org / 54.186.218.12

pmta2.delivery6.ore.mailhop.org / 54.200.129.228

pmta2.delivery7.ore.mailhop.org / 54.149.205.143

pmta2.delivery8.ore.mailhop.org / 54.148.222.11

pmta2.delivery9.ore.mailhop.org / 54.148.30.215

pmta2.delivery10.ore.mailhop.org / 54.69.62.154

Delivery Group 3 

delivery1.ore.mailhop.org / 54.68.193.51

delivery2.ore.mailhop.org / 54.186.60.165

delivery3.ore.mailhop.org / 54.149.154.28

delivery4.ore.mailhop.org / 54.148.229.97

delivery5.ore.mailhop.org / 54.186.22.84

delivery6.ore.mailhop.org / 54.149.26.35