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Thread: E-Mail server

  1. #1
    Join Date
    Mar 2011
    Beans
    3

    E-Mail server

    I have Ubuntu 10.10 server edition on my box on which I set up a blogging service. The main problem is that user have to register and to do this they have to activate their account by a clicking a link in an email, but they are not receiving any EMails from our server and in this I'd like to ask for your help.
    I have a domain, say it mydomain.com
    I have MX record on mail.mydomain.com
    I CAN receive email but can't send any.
    I tried Postfix, Sendmail and Exim4 too.

    Please help me ASAP! Thank you in advance!

  2. #2
    Join Date
    Nov 2008
    Location
    Metro Boston
    Beans
    13,310
    Distro
    Kubuntu 18.04 Bionic Beaver

    Re: E-Mail server

    Does your ISP block outbound port 25 connections? If so, do they have a server you can use to relay mail?

    Quick test. From your server, run:

    Code:
    telnet gmail-smtp-in.l.google.com 25
    If your connection times out, you're blocked.

  3. #3
    Join Date
    Mar 2011
    Beans
    3

    Re: E-Mail server

    Isn't Google's SMTP on 465 port?
    Anyways, I tried it here is the result[]:
    Code:
    root@server:~# telnet gmail-smtp-in.1.google.com 25
    telnet: could not resolve gmail-smtp-in.1.google.com/25: Name or service not known
    root@server:~# telnet gmail-smtp-in.1.google.com 465
    telnet: could not resolve gmail-smtp-in.1.google.com/465: Name or service not known
    My ISP is not providing any mail servers and until today I thought that they are not blocking port 25 but it seems they do. I will look forward, however I would be glad if you could help me to set up the mail server correctly to send mails.

    Thanks in advance!

  4. #4
    Join Date
    Mar 2006
    Beans
    336

    Re: E-Mail server

    Quote Originally Posted by szokeptr View Post
    My ISP is not providing any mail servers and until today I thought that they are not blocking port 25 but it seems they do. I will look forward, however I would be glad if you could help me to set up the mail server correctly to send mails.

    Thanks in advance!
    Yea, I think just about every ISP blocks port 25. I was prototyping a product for a customer at home a few years ago when I realized I was being blocked. Luckily, I have an external host for one of my websites who gave me an alternate port to use to get through my ISP's firewall.

    You can use google's gmail as they offer an alternate port also, which I think is 993 or something like that.

  5. #5
    Join Date
    Mar 2011
    Beans
    3

    Re: E-Mail server

    I'm using GMail now. I dropped a mail to my ISP to ask what's going on but they did not respond yet. The main problem is that GMails server rewrites the From: to the GMail which you used to authenticate.

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