I work for an email security company with a large customer base. We have a change coming up that includes deploying new ranges of Email Sending IPs. We need to contact Verizon, as a third party provider, to let them know about the change to prevent them from blocking these new IP addresses as this will affect both my company and Verizon's customer base.
Where can I submit the change notification? Or is there someone I can speak to regarding this?
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