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选题: 20190802 Use Postfix to get email from your Fedora system
sources/tech/20190802 Use Postfix to get email from your Fedora system.md
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Use Postfix to get email from your Fedora system)
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[#]: via: (https://fedoramagazine.org/use-postfix-to-get-email-from-your-fedora-system/)
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[#]: author: (Gregory Bartholomew https://fedoramagazine.org/author/glb/)
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Use Postfix to get email from your Fedora system
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======
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![][1]
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Communication is key. Your computer might be trying to tell you something important. But if your mail transport agent ([MTA][2]) isn’t properly configured, you might not be getting the notifications. Postfix is a MTA [that’s easy to configure and known for a strong security record][3]. Follow these steps to ensure that email notifications sent from local services will get routed to your internet email account through the Postfix MTA.
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### Install packages
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Use _dnf_ to install the required packages ([you configured][4] _[sudo][4]_[, right?][4]):
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```
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$ sudo -i
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# dnf install postfix mailx
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```
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If you previously had a different MTA configured, you may need to set Postfix to be the system default. Use the _alternatives_ command to set your system default MTA:
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```
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$ sudo alternatives --config mta
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There are 2 programs which provide 'mta'.
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Selection Command
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*+ 1 /usr/sbin/sendmail.sendmail
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2 /usr/sbin/sendmail.postfix
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Enter to keep the current selection[+], or type selection number: 2
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```
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### Create a _password_maps_ file
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You will need to create a Postfix lookup table entry containing the email address and password of the account that you want to use to for sending email:
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```
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# MY_EMAIL_ADDRESS=glb@gmail.com
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# MY_EMAIL_PASSWORD=abcdefghijklmnop
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# MY_SMTP_SERVER=smtp.gmail.com
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# MY_SMTP_SERVER_PORT=587
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# echo "[$MY_SMTP_SERVER]:$MY_SMTP_SERVER_PORT $MY_EMAIL_ADDRESS:$MY_EMAIL_PASSWORD" >> /etc/postfix/password_maps
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# chmod 600 /etc/postfix/password_maps
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# unset MY_EMAIL_PASSWORD
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# history -c
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```
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If you are using a Gmail account, you’ll need to configure an “app password” for Postfix, rather than using your gmail password. See “[Sign in using App Passwords][5]” for instructions on configuring an app password.
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Next, you must run the _postmap_ command against the Postfix lookup table to create or update the hashed version of the file that Postfix actually uses:
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```
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# postmap /etc/postfix/password_maps
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```
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The hashed version will have the same file name but it will be suffixed with _.db_.
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### Update the _main.cf_ file
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Update Postfix’s _main.cf_ configuration file to reference the Postfix lookup table you just created. Edit the file and add these lines.
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```
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relayhost = smtp.gmail.com:587
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smtp_tls_security_level = verify
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smtp_tls_mandatory_ciphers = high
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smtp_tls_verify_cert_match = hostname
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smtp_sasl_auth_enable = yes
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smtp_sasl_security_options = noanonymous
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smtp_sasl_password_maps = hash:/etc/postfix/password_maps
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```
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The example assumes you’re using Gmail for the _relayhost_ setting, but you can substitute the correct hostname and port for the mail host to which your system should hand off mail for sending.
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For the most up-to-date details about the above configuration options, see the man page:
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```
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$ man postconf.5
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```
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### Enable, start, and test Postfix
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After you have updated the main.cf file, enable and start the Postfix service:
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```
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# systemctl enable --now postfix.service
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```
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You can then exit your _sudo_ session as root using the _exit_ command or **Ctrl+D**. You should now be able to test your configuration with the _mail_ command:
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```
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$ echo 'It worked!' | mail -s "Test: $(date)" glb@gmail.com
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```
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### Update services
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If you have services like [logwatch][6], [mdadm][7], [fail2ban][8], [apcupsd][9] or [certwatch][10] installed, you can now update their configurations so that their email notifications will go to your internet email address.
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Optionally, you may want to configure all email that is sent to your local system’s root account to go to your internet email address. Add this line to the _/etc/aliases_ file on your system (you’ll need to use _sudo_ to edit this file, or switch to the _root_ account first):
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```
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root: glb+root@gmail.com
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```
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Now run this command to re-read the aliases:
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```
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# newaliases
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```
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* TIP: If you are using Gmail, you can [add an alpha-numeric mark][11] between your username and the **@** symbol as demonstrated above to make it easier to identify and filter the email that you will receive from your computer(s).
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### Troubleshooting
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**View the mail queue:**
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```
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$ mailq
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```
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**Clear all email from the queues:**
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```
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# postsuper -d ALL
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```
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**Filter the configuration settings for interesting values:**
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```
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$ postconf | grep "^relayhost\|^smtp_"
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```
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**View the _postfix/smtp_ logs:**
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```
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$ journalctl --no-pager -t postfix/smtp
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```
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**Reload _postfix_ after making configuration changes:**
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```
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$ systemctl reload postfix
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```
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* * *
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_Photo by _[_Sharon McCutcheon_][12]_ on [Unsplash][13]_.
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--------------------------------------------------------------------------------
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via: https://fedoramagazine.org/use-postfix-to-get-email-from-your-fedora-system/
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作者：[Gregory Bartholomew][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://fedoramagazine.org/author/glb/
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[b]: https://github.com/lujun9972
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[1]: https://fedoramagazine.org/wp-content/uploads/2019/07/postfix-816x345.jpg
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[2]: https://en.wikipedia.org/wiki/Message_transfer_agent
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[3]: https://en.wikipedia.org/wiki/Postfix_(software)
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[4]: https://fedoramagazine.org/howto-use-sudo/
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[5]: https://support.google.com/accounts/answer/185833
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[6]: https://src.fedoraproject.org/rpms/logwatch
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[7]: https://fedoramagazine.org/mirror-your-system-drive-using-software-raid/
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[8]: https://fedoraproject.org/wiki/Fail2ban_with_FirewallD
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[9]: https://src.fedoraproject.org/rpms/apcupsd
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[10]: https://www.linux.com/learn/automated-certificate-expiration-checks-centos
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[11]: https://gmail.googleblog.com/2008/03/2-hidden-ways-to-get-more-from-your.html
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[12]: https://unsplash.com/@sharonmccutcheon?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
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[13]: https://unsplash.com/search/photos/envelopes?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
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