We own a mail service for several hundred clients and for the past 2 weeks have seen emails to verizon.net customers sporadically fail with the following message: 601 Attempted to send the message to the following ip's: 206.46.232.11
Our mail server attempts to send at regular intervals for up to 24 hours and eventually it will go, but I can see many verizon.net intended emails pile up in our queue for a time, and then it will be fine again for a few hours.
Has there been a recent issue with the verizon.net server? It is causing delays to verizon.net email customers.
It has only just started occurring over the past 2 weeks. Our server has proper RDNS and DNS records and is not blacklisted.
Any insight would be appreciated so we can convey to our clients as well as Verizon customers as to what is causing this delay.
Thanks
{edited for privacy}