Tuesday, October 27, 2009

Verizon port 25 block client Outlook Thunderbird:

Just throwing this out in case someone is Googling for some help.

If you are a Verizon customer with:
  • A non-fixed-IP address (what most customers have).
  • A client-based email program (e.g. Outlook, Outlook Express, Thunderbird).
  • An email account at a non-Verizon and non-gmail domain (e.g. or
You should do the following:
  • Access the accounts in question. (Frequently it's Tools | Accounts | Mail-tab | (select account) | Properties)
  • Make sure the Reply Address is a copy of the Email Address (e.g.
  • Change Outgoing (SMTP) to
  • Make sure the Outgoing Mail Server Requires Verification is checked
  • For Outgoing Mail Server, you must also:
    Set the username to your Verizon email username
    Set the password to your Verizon email password
Close appropriate boxes. You will now be sending email via for your other accounts, but the Reply Address will make recipients think it came from the other domain that you had used before. There is a potential drawback in that the other domain no longer see your mail, and therefore can't archive it or make it available if there is a companion web-access functionality.

Please note that outgoing to any gmail accounts through port 465 is still functional and requires no change.


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