Before starting the installation, a system update is recommended:
sudo apt-get update
sudo apt-get dist-upgrade
Install OpenDKIM and it’s dependencies:
sudo apt-get install opendkim opendkim-tools
Additional packages will be listed as dependencies, type yes and press Enter to continue.
A couple of files must be created and edited in order to configure OpenDKIM.
Nano will be used as an editor because it’s installed by default on DigitalOcean droplets and it’s simple to operate:
navigate with the arrow keys
exit without saving changes: press CTRL + X and then N
exit and save changes: press CTRL + X and then Y, and finally press Enter
Important: replace every instance of example.com with your own domain in all commands and configuration files. Don’t forget to save your files after editing.
Let’s start with the main configuration file: Continue reading “OpenDKIM Postfix SMTP Relay Server on Debian -7” »
This is a quick and fairly painless way of setting up DKIM, on a postfix server. DomainKeys Identified Mail (DKIM) is a method for associating a domain name to an email message, thereby allowing a person, role, or organization to claim some responsibility for the message and helps verify that your mail is legitimate. This will help your email not get flagged a spam or fraud, especially if you are doing bulk emailing or important emails.
This tutorial is written for debian, so if using centos the paths to some files may be /etc/mail prefix or similar.
First, install dkim-filters
apt-get install dkim-filter
yum install dkim-milter Continue reading “DKIM installation on Debian” »
I used the auto installation as guided by the group-office wiki. However, for conveniences, quoting the contents once again:
Easy installation on a dedicated Debian or Ubuntu server
This is the easiest way of installing Group-Office. With the debian packages everything is configured automatically and Group-Office updates will be installed automatically when you update your Debian or Ubuntu system.
Install Debian >= 5 or Ubuntu >=8.10
Note: All the commands here use "sudo". This is necessary on Ubuntu. If you are on Debian you can use the "su" command first and execute all the commands without "sudo".
Add the following line to /etc/apt/sources.list
deb http://repos.groupoffice.eu/ threeseven main
You can do that easily by executing the following command in the terminal:
echo -e "\n## Group-Office repository\ndeb http://repos.groupoffice.eu/ threeseven main" | sudo tee -a /etc/apt/sources.list
To authenticate the packages you need to import the public key by running the folowing commands: In ubuntu don't do this as root because you will have trouble with the gpg keyring permissions. On debian you can do this as root and omit the sudo command before the apt-key add command.
gpg –keyserver hkp://keyserver.ubuntu.com:11371 –recv-keys 01F1AE44
gpg –export –armor 01F1AE44 | sudo apt-key add –
Note: The keyservers are often very slow. If the keyserver doesn't respond you may try this one instead: hkp://pgp.mit.edu Continue reading “Group-Office installation on Debian 6.x” »
Let's install Postfix and Dovecot (Dovecot will be our POP3/IMAP server):
yum install cyrus-sasl cyrus-sasl-devel cyrus-sasl-gssapi cyrus-sasl-md5 cyrus-sasl-plain postfix dovecot
Next we configure SMTP-AUTH and TLS:
postconf -e 'smtpd_sasl_local_domain ='
postconf -e 'smtpd_sasl_auth_enable = yes'
postconf -e 'smtpd_sasl_security_options = noanonymous'
postconf -e 'broken_sasl_auth_clients = yes'
postconf -e 'smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination'
postconf -e 'inet_interfaces = all'
postconf -e 'mynetworks = 127.0.0.0/8'
We must edit /usr/lib/sasl2/smtpd.conf so that Postfix allows PLAIN and LOGIN logins. On a 64Bit Centos 5.0 you must edit the file /usr/lib64/sasl2/smtpd.conf instead. It should look like this: Continue reading “Postfix Configuration on Centos 5.x” »