I'm having the same issue as this post:
https://forums.verizon.com/t5/Verizon-net-Email/Verizon-Blocking-Emails-From-My-IP/td-p/833753
My hosting company is inmotionhosting. The original email server we were on had no problems sending emails. Inmotion moved our server and gave us a new IP then we were being blocked by Verizon. We were having other problems at the same time so we moved to a dedicated email server just for our company. This was all in a period of 2 months. On the dedicated server we are still being blocked by Verizon. I've filled out the whitelist request form multiple times and getting a response of:
"Your IP has been blocked because of spam issues or because your ISP indicates that it is dynamically assigned"
I thought that maybe because we changed ip's so often your system would think we had a dynamic ip. But it appears it must be something else. Please help, this is impacting our buisness and needs to be resolved. Thanks!