Archive for April, 2013
Configure DKIM on Postfix
Here are steps to configure DKIM on Postfix.
I configure DKIM on Postfix using the Ubuntu.
1. Install dkim
sudo apt-get update sudo apt-get upgrade sudo apt-get install opendkim opendkim-tools |
2. Configure /etc/opendkim.conf
Domain yourdomain.com KeyFile /etc/mail/mail.private Selector mail |
3. Configure /etc/default/opendkim file
Add to the end of the file.
SOCKET="inet:8891" |
4. Configure /etc/postfix/main.cf file
Add these configuration options to the end of the main.cf file.
# DKIM milter_default_action = accept milter_protocol = 2 smtpd_milters = inet:localhost:8891 non_smtpd_milters = inet:localhost:8891 |
5. Create directory /etc/mail and go there with cd
6. Generate keys in /etc/mail
sudo opendkim-genkey -t -s mail -d youdomain.com |
After generating keys you’ll have mail.private and mail.txt in the directory. mail.private is your private key and mail.txt is the public key that you should set as TXT record of the domain.
7. Configure your domain TXT record for DKIM
mail.txt contains what you should set for the domain. It contains something like this:
mail._domainkey IN TXT "v=DKIM1; k=rsa; t=y; p=MIG...QAB" ; ----- DKIM key mail for youdomain.com |
This means that you need to create TXT record for you domain that has mail._domainkey as a “host name” and v=DKIM1; k=rsa; t=y; p=MI…AQAB as a “ip address/url”.
7. Start opendkim and restart Postfix
sudo service opendkim start sudo service postfix restart |
8. Useful links
Short ssh alias to access to remote host via ssh
Often, when I want to access my remote DigitalOcean server I have to find out the IP address of it. It isn’t comfortable for me so I decided to create a short alias for this IP in /etc/hosts. Now, after I’ve just made an alias, it’s really more comfortable and faster to login to the remove server via ssh.
/ets/hosts
localhost
infous-desktop
your_alias
|
Login via ssh using the alias
ssh
|
UPDATE:
The another way to set the ssh alias is to edit the ~/.ssh/config file.
Host your_alias Hostname |
Then to login just type:
ssh
|
But there’s a shorter way. Again, edit ~/.ssh/config and set:
Host your_alias Hostname User your_user |
Now, you can login to your remote host via ssh like:
ssh your_alias
|
Thanks to everybody that commented this little note and suggested more elegant solutions!