does pacbell/yahoo dsl block local smtp sending?

Discussion in 'OT Technology' started by D1G1T4L, May 14, 2005.

  1. D1G1T4L

    D1G1T4L Active Member

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    For some reason, i have a program that suppose to send an email from local server (smtp), it doesnt go through, i tried it on my friends computer, same thing happened, but when we tried it on another person's computer (all of them have the same dsl service - sbc dsl - except he has static ip), the guy with the static ip, the program send out an email

    is there a way to explain this?
     
  2. Zourn

    Zourn 16-bit Ninja OT Supporter

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    When I used SBCYahoo DSL I never had any problems with blocked ports. :dunno:
     
  3. mdaniel

    mdaniel S is for Shiksa

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    It wouldn't surprise me. I worked on a system today that couldn't use a remote SMTP server. They were using SBC Yahoo DSL with PPPoE done in the modem. Attempting to use their domain host's smtp server in Outlook 2003 failed. The error message was something like "the server exists, but we couldn't communicate with it". All of the settings looked fine.
     
  4. P07r0457

    P07r0457 New Member

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    possible that port 25 is blocked -- it's becoming more and more common. That's why I run mail services on a non-standard port.

    Test with this to verify:

    telnet smtp.server.tld 25

    and see if it can connect.
     
  5. D1G1T4L

    D1G1T4L Active Member

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    it does connect to local ip, thats what the program is using i am guessing
     
  6. turbo91

    turbo91 New Member

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    Is the program an smtp server, or is it just trying to sent the email via smtp? If it's the latter, you need to be running something like sendmail.

    I hope you aren't trying to spam. :squint:
     
  7. D1G1T4L

    D1G1T4L Active Member

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    the program has its own smtp server i believe, if it wasnt, i would have to install some kind of smtp server on my computer
     
  8. turbo91

    turbo91 New Member

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    Then try what the other guy suggested:

    telnet smtp.earthlink.net 25

    if you can connect, you aren't being blocked.
     
  9. P07r0457

    P07r0457 New Member

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    not true. the ISP is not going to block their own mail server, uh fucking duh? :mamoru:
     
  10. turbo91

    turbo91 New Member

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    He said the program SENDS an email using a local smtp server. Read the fucking post. This implies the following:

    Email dispatched to local mail server -> local mail server looks up the MX of the destination and connects directly to it.
     
  11. P07r0457

    P07r0457 New Member

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    I think YOU need to read the post :rofl:
     
  12. turbo91

    turbo91 New Member

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    tell me where i'm confused.
     
  13. EvilSS

    EvilSS New Member

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    SBC blocks outbound 25 on dynamic accounts. You have to request that it be opened for your account here: http://help.sbcglobal.net/servabuse.php
     
  14. D1G1T4L

    D1G1T4L Active Member

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    THANKS MAN! needed to know that!
     
  15. D1G1T4L

    D1G1T4L Active Member

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    hey what do you mean by local mail server looks up the MX of the destination

    can you collaborate more on that?
     
  16. P07r0457

    P07r0457 New Member

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    You are confused here:

    Its fucking obvious that an ISP is *NOT* going to block their own SMTP server, so your post recommending they do such is worthless.
     
  17. turbo91

    turbo91 New Member

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    :ugh:

    I told him to try the same fucking thing you did. He doesn't use earthlink.net. If he can connect to earthlink's smtp server, then Yahoo! isn't blocking his outgoing port 25 connections, which is what it sounded like he wanted to know.

    idiot.
     
  18. turbo91

    turbo91 New Member

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    To figure out where to send a piece of mail for a particular domain, the DNS record (or parts thereof) for the domain is fetched. One piece of meta data within a dns record are "MX" (mail exchange) servers. These specify the names of servers to which mail can be sent.

    You can see all this stuff using the "dig" utility w/ Linux or Mac OS X. Example for Yahoo.com:

    Code:
    mini:~$ dig MX yahoo.com
    
    ; <<>> DiG 9.2.2 <<>> MX yahoo.com
    ;; global options:  printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31613
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 5, ADDITIONAL: 19
    
    ;; QUESTION SECTION:
    ;yahoo.com.                     IN      MX
    
    ;; ANSWER SECTION:
    yahoo.com.              101     IN      MX      1 mx3.mail.yahoo.com.
    yahoo.com.              101     IN      MX      5 mx4.mail.yahoo.com.
    yahoo.com.              101     IN      MX      1 mx1.mail.yahoo.com.
    yahoo.com.              101     IN      MX      1 mx2.mail.yahoo.com.
    .
    .
    .
    
    Here, you can see the 4 different servers yahoo specifies for incoming email.
     
  19. EvilSS

    EvilSS New Member

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    Uh, his ISP is SBC, NOT EARTHLINK. You might want to read more carefully next time.
     

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