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Apreche
Asked: 2009-08-14 19:13:35 +0800 CST

How to Setup Ubuntu Mail Server with Google Apps?

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I have a domain, let's call it foobar.com. All of the MX records for foobar.com point to Google's mail servers because I am using Google Apps for your domain to manage it. It's great because everyone gets all the advantages of GMail, but our e-mail addresses aren't @gmail.com.

I also have a server. Primarily, it's a web server, but it also serves other things. One of the things it serves is the web site for foobar.com and also sites for various virtual hosts such as shop.foobar.com and forum.foobar.com. The server is running Ubuntu 8.04, because I like using LTS releases in production.

The thing is, there are various applications running on the server that need the ability to send out emails. Various applications, like the cron jobs, send me e-mails in case of errors. Some of the web applications need to send e-mail to users when they forget their passwords, to confirm new registered users, etc. Lastly, it's nice to be able to send e-mail from the command line using the mail command, or mutt.

How can I setup the mail on the web server to go through the Google apps mail servers? I don't need the web server to receive mail, though that would be cool. I do need it to be able to send mail as any legitimate address @foobar.com. That way the forum application can send mails with [email protected] in the from field, and the ecommerce application will have [email protected] in the from field. Also, by sending the mail through the Google servers, we can avoid a lot of the problems with the e-mails being blocked by various spam filters on the web. Google's SMTP servers are trusted a lot more than mine would be.

I'm pretty good with administering Linux systems, but I am absolutely brain dead when it comes to e-mail. I need step by step directions from beginning to end on how to set this up. I need to know every thing to install, and every single change to the configuration files that is necessary. I have tried following various howtos and guides in the past, but none of them were quite right. Either they didn't work at all, or they offered a configuration that is not what I wanted.

Please help. Thanks.

linux

6 Answers

  1. Best Answer

    Easiest way to do this is to avoid using exim and to use sSMTP which is a lightweight MTA.

    All you need to do is install it:

    sudo apt-get install ssmtp mailutils

    and configure it (edit /etc/ssmtp/ssmtp.conf) to use your Google Mail servers see:

    [email protected]
mailhub=smtp.gmail.com:587
UseSTARTTLS=yes
UseTLS=yes
[email protected]
AuthPass=password
FromLineOverride=YES

    I've been using this set-up for a while now and it just works - It's also nice to not need to be running exim when it's not necessary and let Google's mail servers handle everything for you.

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  2. Basically, it's very easy.

    $ sudo dpkg-reconfigure exim4-config

    Choose all things that make sense for you - as long as you choose something with a smarthost. When the question that asks you what smarthost to use comes, answer: smtp.gmail.com::587

    Then edit the file /etc/exim4/passwd.client to match

    gmail-smtp.l.google.com:[email protected]:p@sSw0rd
*.google.com:[email protected]:p@sSw0rd
smtp.gmail.com:[email protected]:p@sSw0rd

    And that does the job.

    ssmtp also works fine, but appeared rather slow for mail delivery. Also, I prefer to have a deamon to connect to.

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  3. Keep in mind that free version of GMail has an outbound limit of ~500 messages / day. If you don't exceed this limit muffin's solution would work great for you.

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  4. You should be able to use Google's mail servers as your SMTP gateway and authenticate with a user.

    http://www.google.com/support/a/bin/answer.py?hl=en&answer=60730

    Here's some basic psudocode to give you an idea:

    smtpHost = smtp.gmail.com
smtpUsername = [email protected]
smtpPassword = your_password
smtpType = tls
smtpPort = 465

    UPDATE:

    Here's a link which might help a little. Its not EXACTLY what I was looking for but reasonable enough (I hope) to give you an idea that it is possible to have cron jobs send email via google apps.

    http://bakingnoodles.com/tag/linux/

    This little app might prove useful as well (warning: I have not tried it myself)

    http://linux.softpedia.com/get/Communications/Email/Email-2-6805.shtml

    Another option might be to configure Postfix to use Google Apps for all of your mail delivery. If you search google for "configure postfix google apps" you'll find a bunch of links, including this one:

    http://blog.twinklesprings.com/2008/03/27/remote-mail-delivery-for-google-apps-and-postfix-mail-server/

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  5. If you don't need to receive mail, you really don't need to send it through Google. If you setup your DNS records correctly, you should be able to send mail from the MTA on the web server.

    If you are using SPF you'll want to make sure you update it to include your application server.

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  6. It is quite simple in postfix:

    nano /etc/postfix/main.cnf

    change the following

    mydestination = mydomain.com, localhost.mydomain.com, localhost

    to

    mydestination = localhost.mydomain.com, localhost

    reboot your server and you're done!

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