Postfix - Installation
The base package for all the mail articles will be postfix. There are alternatives to postfix, each with advantages and disadvantages and, without going into the differences, we have chosen Postfix due its relative ease of configuration. Those seeking an email solution that does not require configuring a mail server should look at our Mailgun service. More information can be found on the Mailgun website.
With all that out of the way, let's go ahead and install Postfix! Remember, we assume that you're using Ubuntu Hardy, set it up using our instructions, and have gone through the basic setup instructions here and here.
Installation is very easy. We'll be using aptitude to install the software itself.
sudo aptitude install postfix telnet mailutils
Note that we also install telnet and mailx as they contain several tools we'll use to test and configure postfix.
During the installation you will be asked the general type of mail configuration:
Choose the 'Internet Site' option.
You will then need to enter your main domain name (this should match the hostname we set in the previous article).
At this stage, you can send emails from your application.
The preparation we did in the previous article and the settings shown above during the postfix installation mean that the very basics are already done.
Although we will look in more detail at sending mail in the next article, let's conduct a quick test to see if postfix is actually sending mail.
You will need to send an email to a working email address using the 'mail' command:
Replace the email address with one of your choosing (remember this must be a working email address).
The output asks for the subject of the email. Once done, press enter/return.
Next enter the subject of the email. Once done, press enter/return and then a single period (.) - the period lets mail know the body is finished. If that doesn't actually end the message, type "control-D" instead (hold down control and press the D key at the same time).
Finally press enter/return again to send the email (you may need to do this twice so you skip the 'CC:' entry.
The output on my machine looks something like this:
mail email@example.com Subject: test email from democloud.com test body of the email. . Cc:
No confirmation is given that the email has been sent (the logs will show the details) but check the receiving email address and voila! a nice, fresh email with the subject 'test email from democloud.com'.
For many people, that is all you need to send mail from your application - especially if the only emails are notifications to the site administrator.
However, the next article will look in more detail at the settings in Postfix's main.cf file and what they mean. This can help in reducing the chances of your email being classed as spam or your Cloud Server IP being blacklisted.
Installation of postfix is very simple using the aptitude package manager.
Once installed, email can be sent straight away.
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