Hi,
we started using ipv4 prefix 185.153.192.0/22 recently assigned by RIPE to us.
As this prefix was probably never used before, almost every single ip has bad reputation at Symantec.
Especially, our MX adresses repeatedly showed up on blacklist every day. Now, one of MX adresses is not blacklisted for about week, but users are still complaining about often delivery problems even when email is received by destination server.
Namely adresses are 185.153.193.90 - now not blacklisted, but still with somehow wrong reputation.
And 185.153.194.237 - now also not blacklisted, we had to stop sendind throught this system - symantec reasons.
(Important to add - those MX are just readressed systems, previously used without any issue with old ipv4 adresses for ages, no any other blacklist members)
Can you please check the prefix and give us some detailed information about what is wrong with this newly assigned prefix?
Also - can you give us brief description how does symantec build reputation and how to raise it?
Many thanks
Martin Kylian