Please add ALL of the delivery IP addresses to your firewall or filters. 


These are the IP's that we use to deliver mail to your servers and having an accurate list configured on your firewall or filtering tool will ensure that you your email arrives at it's destination. 

This list was updated and shortened on Friday, April 15, 2016 with European Servers


IP ADDRESSES FOR OUTBOUND SMTP SERVERS - https://support.duocircle.com/support/solutions/articles/5000704608-ip-addresses-of-smtp-servers these are not required for Gateway, Email Forwarding, MX Backup, Hosted Email Customers. 



Delivery Servers

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


Delivery Group 1 North America Zone 1


54.191.214.3

54.149.210.130

54.191.214.36

54.191.151.194

54.148.219.64

54.149.206.185

54.186.27.61

54.191.158.99

54.186.172.23

54.149.36.10


Delivery Group 2 North America Zone 2


54.149.155.156

54.69.130.42

54.213.22.21

54.200.247.200

54.186.218.12

54.200.129.228

54.149.205.143

54.148.222.11

54.148.30.215

 54.69.62.154


Delivery Group 3 - North America Zone 3


54.68.193.51

54.186.60.165

54.149.154.28

54.148.229.97

54.186.22.84

54.149.26.35


Delivery Group 4 -  European Union Zone 1


52.28.30.98

52.29.118.68

52.29.142.239

52.29.144.204

52.29.147.143

52.29.152.107

52.29.162.96

52.58.5.29

52.58.7.81

52.58.7.120