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Outbound MTA IPs

This is a list of all MTAs from which outbound mail can be sent.

Hostname IP
eastrmfep01.cox.net 68.230.240.57
eastrmfepi101.cox.net 68.230.241.197
eastrmfepi102.cox.net 68.230.241.198
eastrmfepi103.cox.net 68.230.241.199
eastrmfepi104.cox.net 68.230.241.200
eastrmfepi105.cox.net 68.230.241.201
eastrmfepi106.cox.net 68.230.241.202
eastrmfepi107.cox.net 68.230.241.203
eastrmfepi108.cox.net 68.230.241.204
eastrmfepi201.cox.net 68.230.241.205
eastrmfepi202.cox.net 68.230.241.206
eastrmfepi203.cox.net 68.230.241.207
eastrmfepi204.cox.net 68.230.241.208
eastrmfepi205.cox.net 68.230.241.209
eastrmfepi206.cox.net 68.230.241.210
eastrmfepi208.cox.net 68.230.241.212
eastrmfepo101.cox.net 68.230.241.213
eastrmfepo102.cox.net 68.230.241.214
eastrmfepo103.cox.net 68.230.241.215
eastrmfepo201.cox.net 68.230.241.216
eastrmfepo202.cox.net 68.230.241.217
eastrmfepo203.cox.net 68.230.241.218
fed1rmfepi105.cox.net 68.230.241.136
fed1rmfepi106.cox.net 68.230.241.137
fed1rmfepi107.cox.net 68.230.241.138
fed1rmfepi108.cox.net 68.230.241.139
fed1rmfepi201.cox.net 68.230.241.140
fed1rmfepi202.cox.net 68.230.241.141
fed1rmfepi203.cox.net 68.230.241.142
fed1rmfepi204.cox.net 68.230.241.149
fed1rmfepi205.cox.net 68.230.241.150
fed1rmfepi206.cox.net 68.230.241.151
fed1rmfepi207.cox.net 68.230.241.152
fed1rmfepi208.cox.net 68.230.241.153
fed1rmfepo101.cox.net 68.230.241.143
fed1rmfepo102.cox.net 68.230.241.144
fed1rmfepo103.cox.net 68.230.241.145
fed1rmfepo201.cox.net 68.230.241.146
fed1rmfepo202.cox.net 68.230.241.147
fed1rmfepo203.cox.net 68.230.241.148
dukecmfep01.coxmail.com 68.99.120.36
dukecmfep02.coxmail.com 68.99.120.37
dukecmfep03.coxmail.com 68.99.120.38
dukecmfep04.coxmail.com 68.99.120.39
dukecmfep05.coxmail.com 68.99.120.40
dukecmfep06.coxmail.com 68.99.120.41
dukecmmtar03.coxmail.com 68.99.120.44
dukecmmtar04.coxmail.com 68.99.120.47

Why am I being blocked?

The error message that was displayed at the time of the block contains information regarding the reason. . More details about the various error messages can be found in the Error Codes section.

Can I get unblocked?

This depends on the reason for the block. The details of the error you encountered are found in the Error Codes section, which contains information on how to request a block be lifted.

Can I be whitelisted?

Protection of our customers and network is paramount. Therefore, we do not whitelist.

Does Cox offer a Feedback Loop?

Yes. See the Feedback Loop section here.

What are Cox's sending limits?

Cox currently allows up to 5 simultaneous connections per sending IP address, and up to 100 messages per connection. However, regardless of these limits, Cox may throttle your sending ability based on your sender reputation. Cox's sending limits and policies are subject to change at any time. Cox will update this website when changes are made.

How do I report abuse?

Please find instructions on how to report abuse here.


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