STEP 1: CHECK YOUR EMAIL CONFIGURATION
Here are two things to check about your mail configuration:
Email Client
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Check that the Outgoing Mail Server (SMTP) setting on your email client (such as Outlook Express or Mail) is using the outgoing mail server for your ISP. Most ISPs require that you use their mail server to avoid spamming incidents.
Email Server or Proxy Server
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If you run a mail server on your computer, or if your local network uses a proxy server, set the SMTP Gateway setting on the mail server or proxy server to your ISP's outgoing mail server. This will force your mail server or proxy server to send all outgoing mail to the ISP first, and then the ISP will relay it to its final destination.
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Note: If you are a RoadRunner business customer, you may need to contact your ISP to get your business IP marked as static. They will then let Trend know of the change.