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Thread: Can send but can't receive external e-mail

  1. #1
    davidelon is offline Starter Member
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    Default Can send but can't receive external e-mail

    Hi Everyone,
    i installed the ZCS 6.05 in a ubuntu server 8.04 LTS.
    everything gone right, even the installation of BIND9.
    i can succesfully send e-mail (ex from user@mydomain.it to user@gmail.com)
    but if i reply from @gmail to @mydomain, i can't receive anything.
    I have not a static ip address, but a dynamic ip address. Maybe my isp is blocking me?
    Thank you for your reply (i'm sorry for my english but i'm italian )
    DAvide

  2. #2
    quietas is offline Elite Member
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    You'll need to check MX records for your DNS registrar. If you are using a dynamic IP, you'll need to sign up for a static or setup a Dynamic DNS host such as DynDNS or No-IP and then pay a small amount for the MX capability.

    Also check that your ISP is not blocking port 25. If they are, most DDNS hosts can also do port forwarding so port 25 sends to port 2500 or something like that.
    Culley
    Mail | Dell 2950III | 2x Quad Core 5420 | 8gb RAM | 6x 146gb SAS RAID 0+1 | Red Hat 5.3 | Zimbra 6.0.10 Network Edition
    Test | VMware ESXi Whitebox | Phenom II Black 3.2ghz | 12gb RAM | 6x 1tb SATA RAID 0+1 | CentOS 5.4 | FOSS, Not in use now

  3. #3
    davidelon is offline Starter Member
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    thank you for your reply quietas.
    I have a record A for my mailserver (mail.mydomain.it) and its assocciated MX record.
    I even have an account for No-Ip, in fact i can reach the webmail with the dns redirection provided by no-ip.
    I have one question: in my dns control panel, i need both A record and MX record ? or I can add A record and then go to no-ip and add an MX record?
    then, how can I check if my isp is blocking port 25 ?
    thank you
    DAvide

  4. #4
    quietas is offline Elite Member
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    It sounds like port 80 is fine if you can get to the webmail portion. You will need both A and MX records setup at No-IP so the outside world knows where the server is located and where to send the mail to.

    If you are on a compuer behind the firewall with that IP, go to **Home of Gibson Research Corporation** and use the Shields UP tool to scan you IP for open ports. There are other IP scanners out there which can scan for open ports on specified IP addresses also.
    Culley
    Mail | Dell 2950III | 2x Quad Core 5420 | 8gb RAM | 6x 146gb SAS RAID 0+1 | Red Hat 5.3 | Zimbra 6.0.10 Network Edition
    Test | VMware ESXi Whitebox | Phenom II Black 3.2ghz | 12gb RAM | 6x 1tb SATA RAID 0+1 | CentOS 5.4 | FOSS, Not in use now

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