is blocking IP


We have a problem with mail delivery from domain '' ( to accounts on ''. All outgoing mail is blocking from Verizon's side. We've checked the sever for a possible spam sending but haven't found anything suspicious. Also we've checked our IP for reputation and in blacklists but it doesn't locate in any of them. Results of checking you may find below [1].

So, we've sent request for a delisting but recieved following reply [2]. Please note that RDNS have been already set on the server before we've sent request for delisting.

During cehcking your forum we've found post with the same problem [3]. So we've also tried to discuss this issue in online chat but it wasn't helpful, as support ask us to call 877-462-8188. Unfortunately we can't call you, so please investigate for this problem and, if it possible, whitelist IP

Thank you.

[1] Results of checking IP in blacklist and reputation

[2] Recieved reply for delist:


After investigation, Verizon Online Security has determined that e-mail from your IP address will not be allowed access to the Verizon Online e-mail domain due to one or more of the following reasons: 

Your IP has been blocked because of spam issues or because your ISP indicates that it is dynamically assigned

 No Reverse Hostname associated with your IP address.



Re: is blocking IP
Champion - Level 1

Your issue has been escalated to a Verizon agent. Before the agent can begin assisting you, they will need to collect further information from you.

Please go to your profile page for the forum, and look in the middle, right at the top where you will find an area titled "My Support Cases". You can reach your profile page by clicking on your name beside your post, or at the top left of this page underneath the title of the board.

Under “My Support Cases” you will find a link to the private board where you and the agent may exchange information. This should be checked on a frequent basis as the agent may be waiting for information from you before they can proceed with any actions.

To ensure you know when they have responded to you, at the top of your support case there is a drop down menu for support case options. Open that and choose "subscribe".

Please keep all correspondence regarding your issue in the private support portal.