CERNET is using icoremail.net to send email and that seems to have a crazy pool

[markrprior]

I have no idea how rigorous icoremail.net is with its service but it would seem that they don't make it easy for the greylist process.

A friend on the Chinese University network (CERNET) tried to send me email but it bounced. On investigation from my side it would seem that not only are they using icoremail.net but it's just a dog's breakfast of addresses. They probably have more but these are the messages I got before it gave up (and my friend fell back to using a personal gmail account).

RCPT from azure-sdnproxy.icoremail.net[207.46.229.174]
RCPT from zg8tmtyylji0my4xnjeumjiw.icoremail.net[162.243.161.220]
RCPT from zg8tmja2lje4os43os4xodqa.icoremail.net[206.189.79.184]
RCPT from azure-sdnproxy.icoremail.net[52.237.72.81]
RCPT from zg8tmtu5ljy1ljeznc42.icoremail.net[159.65.134.6]
RCPT from azure-sdnproxy.icoremail.net[20.231.56.155]
RCPT from zg8tmja2lje4os4yms4ymjma.icoremail.net[206.189.21.223]
RCPT from sgoci-sdnproxy-4.icoremail.net[129.150.39.64]
RCPT from zg8tmja5ljk3lje4ms43mwaa.icoremail.net[209.97.181.73]