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Verizon.net emails cannot send from my server

I administer a web application that allows users to send email from the application via their email account's SMTP server. Yesterday I began receiving complaints that users with @verizon.net email addresses could no longer use this feature, receiving a timeout error on the SMTP connection. This problem only exists when attempting to connect via SMTP and send email from my application's production server. Attempts to connect and send from testing platforms using different IP Addresses work fine as always.

The IP address in question is not on any blocklist that I have checked. I can't locate any whitelisting procedure to verify an IP address to connect to Verizon.net's SMTP, only a procedure to have an outside email address that cannot send in to verizon addresses whitelisted. Does anyone know how I can resolve this problem?

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[Deleted User]

Hi djroedger,

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 at the top of the middle column 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.

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