Announcement

Collapse
No announcement yet.

ISP blocking port 25... any suggestions?

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • ISP blocking port 25... any suggestions?

    guys, I installed exchange 2003 at my home network, and make the necessary changes to my mx records for my outside DNS name... forwarded port 25 on my modem and firewall... but when I tested for connections on port 25 with telnet... I got "unable to connect"... so I opened a different port this time 23 "telnet" and forwarded to my server... this time connection was ok... I later went on to google to find out if bellsouth/AT&T was doing any port blocking/filtering for port 25 and indeed they are... any how, my questions is has this happened to anyone here?... and what are the possible solutions to this?


    ____________
    thanks
    -JV
    blog: pctechtips.org

  • #2
    Re: ISP blocking port 25... any suggestions?

    A different ISP?
    Or more likely a business rather than a home service (they've got to make their $$$ somehow)
    Tom Jones
    MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
    PhD, MSc, FIAP, MIITT
    IT Trainer / Consultant
    Ossian Ltd
    Scotland

    ** Remember to give credit where credit is due and leave reputation points where appropriate **

    Comment


    • #3
      Re: ISP blocking port 25... any suggestions?

      Your only option without paying for any additional service is to route the email via your ISPs SMTP Server using an SMTP Connector.
      http://www.amset.info/exchange/smtp-connector.asp

      If that doesn't work for you then you will need to pay for a mail hop service. (No there are no free mail hop services, as spammers would quickly abuse them).

      Simon.
      --
      Simon Butler
      Exchange MVP

      Blog: http://blog.sembee.co.uk/
      More Exchange Content: http://exchange.sembee.info/
      Exchange Resources List: http://exbpa.com/
      In the UK? Hire me: http://www.sembee.co.uk/

      Sembee is a registered trademark, used here with permission.

      Comment


      • #4
        Re: ISP blocking port 25... any suggestions?

        Originally posted by Sembee View Post
        Your only option without paying for any additional service is to route the email via your ISPs SMTP Server using an SMTP Connector.
        http://www.amset.info/exchange/smtp-connector.asp

        If that doesn't work for you then you will need to pay for a mail hop service. (No there are no free mail hop services, as spammers would quickly abuse them).

        Simon.
        will this setup allow me to receive inbound email to my exchange even though port 25 is blocked by my ISP?.... and another question all the email clients in my network since I brought my exchange online have lost their settings, is exchange imposing itself that is overriding any settings that outlook and outlook express might have?

        __________
        Thanks
        -JV
        blog: pctechtips.org

        Comment


        • #5
          Re: ISP blocking port 25... any suggestions?

          If the ISP is blocking inbound port 25 as well, then you have no other options than to pay more money.
          Either to the ISP for a business service, or to a mail hop service for inbound email. There are NO free options available for inbound email.

          Exchange will not touch Outlook Express settings. As for Outlook settings, unless it is an SBS server then it doesn't override anything, but Outlook will always attempt to route email via Exchange if it is connected to an Exchange server.

          Simon.
          --
          Simon Butler
          Exchange MVP

          Blog: http://blog.sembee.co.uk/
          More Exchange Content: http://exchange.sembee.info/
          Exchange Resources List: http://exbpa.com/
          In the UK? Hire me: http://www.sembee.co.uk/

          Sembee is a registered trademark, used here with permission.

          Comment


          • #6
            Re: ISP blocking port 25... any suggestions?

            Originally posted by Sembee View Post
            If the ISP is blocking inbound port 25 as well, then you have no other options than to pay more money.
            Either to the ISP for a business service, or to a mail hop service for inbound email. There are NO free options available for inbound email.

            Exchange will not touch Outlook Express settings. As for Outlook settings, unless it is an SBS server then it doesn't override anything, but Outlook will always attempt to route email via Exchange if it is connected to an Exchange server.

            Simon.
            I have not tested outbound, but I know is blocking inbound as I tried to telnet into port 25 and it was not accepting connections... so what's the point of creating a connector for sending mail, if I can't receive any mail....

            no my outlook only gets message from google, but since I installed exchange everytime I start outlook it ask me to configure it...

            and for hop inbound email services, I'm a bit unclear how that's going to help me, b/c at some point that server needs to send me the email intended for my organization, and if ISP is blocking port 25, how is that going to work, unless I'm missing the point of a mail hop service for inbound

            _______________
            Thanks
            -JV
            blog: pctechtips.org

            Comment


            • #7
              Re: ISP blocking port 25... any suggestions?

              actually exchange didn't take over my outlook, it seems that after joining this machine to domain I login with same user name but to the domain, so that's a different profile, and although I copied over the profile, I got all "my document", IE, settings etc... but outlook didn't get my settings, isn't outlook part of your profile?


              ___________
              Thanks
              -jv
              blog: pctechtips.org

              Comment


              • #8
                Re: ISP blocking port 25... any suggestions?

                When you copy the profile you are copying the file structure but the Outlook settings are stored in the user's registry hive, which doesn't get copied. Some Outlook components, such as the signature file, NK2 file, etc. that are part of the file system will get copied.

                Comment


                • #9
                  Re: ISP blocking port 25... any suggestions?

                  Originally posted by Sembee View Post
                  If the ISP is blocking inbound port 25 as well, then you have no other options than to pay more money.
                  Either to the ISP for a business service, or to a mail hop service for inbound email. There are NO free options available for inbound email.

                  Exchange will not touch Outlook Express settings. As for Outlook settings, unless it is an SBS server then it doesn't override anything, but Outlook will always attempt to route email via Exchange if it is connected to an Exchange server.

                  Simon.
                  I have found a couple of good options, but I'm undecided as far as what I really need, I don't want to over pay of the service....
                  1) DynDNS.com offers a MailHop Realy for 42$ year... among other things it "Relay mail to any of the following ports: 24, 25, 587, 2525, 10025, 52525"
                  2) no-ip.com has a "Alternate port-smtp" for 19.99 a year for 150 msg a day...

                  now I was tesing my outbound connection to port 25 and it seems that the only mail I can connect is to my ISP as I got some "nslookup" mx for microsoft.com and I can make a telnet conn.... could that be firewalls at Redmond? or should I try other mail server before?

                  __________
                  Thanks
                  -JV
                  blog: pctechtips.org

                  Comment


                  • #10
                    Re: ISP blocking port 25... any suggestions?

                    The standard domain I test for confirming outbound email is maila.microsoft.com:

                    telnet maila.microsoft.com 25

                    If that server responds then port 25 is open.
                    However if you are on a home type connection it isn't going to be much use to you because most major email providers will have the home internet connections blacklisted - and you will not be able to get the blacklisting removed because it will be at the subnet level.

                    Therefore an SMTP connector for outbound email routed through your ISPs SMTP server is almost mandatory. However if you purchase a mail hop service then you could route email through their service as well.

                    A mail hop service would be for inbound email for your own domain. Rather than having the MX records pointing to your server, it would be pointed to the servers run by the mail hop service. They would then forward the email to you.

                    Simon.
                    --
                    Simon Butler
                    Exchange MVP

                    Blog: http://blog.sembee.co.uk/
                    More Exchange Content: http://exchange.sembee.info/
                    Exchange Resources List: http://exbpa.com/
                    In the UK? Hire me: http://www.sembee.co.uk/

                    Sembee is a registered trademark, used here with permission.

                    Comment

                    Working...
                    X