Prob w outbound SMTP via DirecPC to EarthLink mail server from Outlook mail client

Posted on 2004-11-21
Last Modified: 2007-12-19

I have a customer who is recently having problems sending email using MSFT Outlook, starting on 17-Nov-04.  Her connection to the internet is via DirecPC, but her email account is with EarthLink.

Up until recently, she has been able to send mail through this mailhost swimmingly, regardless of whether she was using a wired or wireless network over DirecPC, or using dialup networking into EarthLink central.

More recent history has been a different and undesirable experience. The symptom is a timeout.

I've done some problem isolation.  The smtp port at the EarthLink mailhost can be connected to using either Outlook or Telnet.  Using Telnet, I do get a greeting from the EarthLink mailhost, so the SMTP protocol does indeed flow unencumbered.  Also, I've been sending email from her computer to my email address via this path, and one message made it through (although the response was that all sent messages had failed).

I've chatted with a technical support representative of EarthLink about what possible changes there may have been with the EarthLink network or mailhost.  He or she said (typed) that the problem is with DirecPC, not with their mailserver, and that we'll need to (re)configure outbound email to go through the DirecPC mailhost.  This conclusion was supported by the fact that the sending of mail when connected via dialup does work.

Does anyone have any thoughts on any of this, or am I just barking up the wrong tree?

Question by:ChrisEddy
    LVL 25

    Expert Comment

    by:Ron M
    During the setup process (POP3 mail wizard)...on the screen where you put in the mail server address and username and password...> there is a button (more settings) it.....then click (outgoing server) tab...check the box that says "my outgoing server requires authentication".......

    good luck.
    LVL 3

    Author Comment

    Thank you for responding!

    I've done that.  A correct userid and password is entered for the outgoing SMTP email server, SPA is not enabled, and ssh is not enabled.  All proper according to the EarthLink email configuration specs.

    Next ...

    LVL 104

    Expert Comment

    Pretty sure that the resolution you were given about using the ISPs SMTP server is the correct one. More and more of the ISPs are no longer allowing residential users to connect to other SMTP servers. Even with authentication and other tricks.
    I would simply switch the SMTP server for outbound email to the SMTP server of DirecPC. If the email still doesn't go then it is an issue that you need to take up with DirecPC. Perhaps they don't allow email to be send through their server unless it is coming from an email address they recognise. While a particularly harsh way to operate an email system, not uncommon.

    LVL 3

    Author Comment

    Here's the results of a telnet to port 25 of the earthlink mail server:

      telnet 25
      Trying ...
      Connected to (
      Escape character is '^]' ESMTP Exim 3.33 #1 Sun, 21 Nov 2004 11:35:31 -0800
      220-NO UCE.  EarthLink does not authorize the use of it's computers or network
      220 equipment to deliver, accept, transmit, or distribute unsolicited e-mail.
      EHLO [my email address] Hello [my reverse resolved host name] [my ip address]
      250-SIZE 10485760
      250 HELP

    This is a positive indication that I've reached the mail server, duplicating my initial test.  

    However it isn't necessarily an indication that an email message can be sent.  The symptom I'm getting from Outlook is a timeout, suggesting that there is some sort of time delay at end-of-the-message time that exceeds a number, which is the failure.  

    Next is to bone up on my SMTP and hand craft a message typed into the EarthLink mail server, and seeing what happens.  

    LVL 104

    Accepted Solution

    Getting the connection isn't enough as you have guessed. If they are only allowing messages through that meet their requirements, then it will allow the connection, it is only when you actually try to send a complete message that you will see if that is the problem. I am surprised they aren't NDR the emails though.

    Google for SMTP Telnet test to find the commands that you need. I can never remember them either so will usually just look someone else who has them already.

    LVL 3

    Author Comment


    Thank you for the pointer to a very useful shortcut!

    I have completed the telnet test as directed, and the results indicate the reason why EarthLink is declining the email: relaying a message from outside the EarthLink network is declined.

    Here *are* the results of the telnet test to port 25 of the EarthLink email server:

    telnet 25
      connected to (
      Escape character is '^]'. ESMTP Exim 3.33 #1 Sun, 21 Nov 2004 17:18:32 -0800
      220-NO USE.  Earthlink does not authorize the use of its computers or network
      220 equipment to deliver, accept, transmit, or disribute unsolicited e-mail.
    ehlo Hello [my reverse resolved host name] [my ip address]
      250-SIZE 10485760
      250 HELP
    mail from:[my email address within earthlink]
      250 <[my email address within earthlink]> is syntactically correct
    rcpt to: [my target email address]
      550-EarthLink does not recognize your computer ([my ip address]) as connecting from an EarthLink conneciton.  If this is in error, please contact technical support.
      550 relaying to <[my target email address]> prohibited by administrator
      503 Valid RCPT TP <recipient> must precede DATA

      421 SMTP command timeout - closing connection
      Connection closed by foreign host.

    As can be seen by the test results above, the root of the problem is a relay denied error currently being reported by EarthLink.  Whether this was a recent change on the part of EarthLink or not is irrelevant, but unfortunately apparently coincident with the fact that I recently configured a new wireless network for my customer, and now she's reporting email sending failures.  The fact that Outlook does not return the actual error text, but instead reports some unhandled error and number is unfortunately misleading, and may be due to the fact that the mail server does eventually timeout because Outlook doesn't handle enough of the failure cases - such as this one.

    Thank you all for your suggestions and guidance!  I now have real data on which to base a recommendation.  


    Expert Comment

    Configure your clients mail program to use outbound SMTP authentication.  Earthlink will not accept mail from hosts that are not directly connected to their network without the authentication.  The username would be your customers email address and the password would be the same as the POP3 authentication.

    I fought this problem before with Earthlink.  Took a couple of live support chats to get them to cough up the info about the authentication.

    The fact that you were able to test via telnet proves that DirecPC is not doing anything that would affect your connection.


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