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DL-524 send mail

I cannot send a mail -- cannot receive SYN_SENT.
I have tested every thing on my router configuration.
May be the port 25 is not open on my router Dl-524

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  • stoyan Nov 13, 2008

    Hi Stellyx,
    I use debian sid, Thunderbird (Icedove 2.0.0.17) client, but I've tested with other computers (windows xp, ubuntu).

    I've tested different configurations on the router; filters, firewalls for port 25 (enable/disable, DMZ).
    I think (I am sure) that the problem is in the router Dl-524 -- some configuration or ... I don't know.
    Thank you very much,
    Stoyan



  • stoyan Nov 13, 2008

    stoyan@backus:~$ telnet mail.... 25
    Trying 205....... ...
    telnet: Unable to connect to remote host: Connection timed out


    From the other places (without using the router) this is OK


  • Stellyx
    Stellyx May 11, 2010

    Hi Stoyan,

    just a couple questions.

    What email service do you use?
    do you use outlook or another program to access your email?


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Thank you very much for the help.
I found the reason of blocked port 25.
It was blocked by my ISP. I could not imagine that ISP would like to block some ports, and I looked for my errors in router and computer configurations.
All the best!
Stoyan

Posted on Nov 18, 2008

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I have tested every thing. It is ok, EXEPT port 25. It is filtered (firewalled) by the router Dl-524. I can send request to the mail server, but I can not receive the SIN_SENT answer from the server (again on port 25). I have sniffed the connection.

I've restarted, rebooted, reset, reloaded the router configuration, the same.

Are there some info about this behaviour?

Posted on Nov 14, 2008

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First of all you can check with enabling all ports in router for your perticuar IP.

If still it's not working, then check your mail server configuration i.e. SMTP mail server address, SMTP port number ,Antivrus Rule blocking on your computer.

Posted on Nov 14, 2008

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Hi,

Are normal network services available to you:-

1) can you ping a server on the Internet?
2) can you browse the Internet?
3) Is the problem only email, if so do you know which mail server you are trying to access?

You shouldnt need to open up any rules in the firewall for SMTP, unless you are hosting a mail server. When you request mail from behind the firewall, most firewalls allow through all traffic from the inside network to the Internet. therefore, if you can see the Internet this is usually a good indication that theres no internal filtering.

all your mail client does is create a connection to port 25 on the SMTP server. You can replicate this by doing :-

telnet <MAIL SERVER ADDRESS> 25

you should get a banner or something up if you can see it. I dont think its a router problem if all other services are woking ok. If you get a banner from the above command, then its definately not a router problem.

ta,

Posted on Nov 14, 2008

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