How To Fix Eudora Error 550 5.7.1

It’s worth reading these fixes if you’re getting the eudora 550 5.7.1 error.

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    This error occurs when some Eudora email clients fail to authenticate a person to the outgoing mail server. If you have a different email provider, make sure someone has checked the port before setting it up, OR you can ask someone in the comments below.



    Nov 17, 2008 3:04:19 PM 17/11/08


    As mentioned earlier, this came out of nowhere. As far as I know, no process has changed. I can’t send anything, but emails are being received
    just fine.
    Has this happened to anyone and do you know how to fix it?
    Mozilla Thunderbird has no problems sending.
    Thank you very much for your help.



    Nov 17, 2008 3:34:23 AM Jsaction=”JIbuQc:Uzli5″ pm11/17/08


    Have you enabled your primary username and password directly in Tools -> Account Settings
    -> Outgoing Mail Server (SMTP) -> Edit? Verizon may have
    changed all settings.

    I can’t see the rest of the new theme here, so maybe I’m missing something from the story. So if you’re satisfied, sorry for my post.Aria-expanded=”true”>

    John H. Meyers


    Nov 17, 2007 10:21:02 PM 17/11/08


    Mon 17-Nov-09 09:04:19 -0600 wrote:

    FranTo As mentioned earlier, this happened quite unexpectedly. To my knowledge, no
    > settings have been changed. I can’t provide anything, but the emails received
    > are actually correct.

    >Thunderbird Mozilla has no problems sending.

    What are these
    settings in Thunderbird for the Verizon SMTP server you used earlier:

    Server name:?
    Use secure connection: [what option?]
    Use name and password [checked?]

    Now look at the “Properties” of the Eudora personality
    that you are using to load (right-click the personality
    icon in the Personality tool window to view “Properties”).

    Is the SMTP server phone the same?

    Are the “secure connection” options in Thunderbird
    the same as the “secure sockets on send” options in Eudora?
    (these are the same four options and therefore each one has the same standard for ports)< /p>

    Does Verizon use port 587?
    Does this match your personal choice of “Use…587” in Eudora?

    Is “Allow Authentication” checked in Eudora? (should)

    Is it specific?What is the username associated with your Eudora
    identity (the sender of the email), the same one you gave Thunderbird?



    Nov 30, 2008 04:12:29 19/11/08


    eudora error 550 5.7.1

    Thank you both. I’m definitely back from a trip and will check it out

    Settings tomorrow.

    I hope to help support your ideas, but I suggest you choose between two things:

    Download this software now to fix your PC and increase its security.

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