Specific emails ID only receive mail from specific domains:





Step 1. At first edit the main.cf file of postfix.

# vim /etc/postfix/main.cf

smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/protected_destinations, permit_mynetworks, reject_unauth_destination

smtpd_restriction_classes = insiders_only

insiders_only = check_sender_access hash:/etc/postfix/insiders, reject

[Explanation: smtpd_recipient_restrictions is a postfix parameter, It will check the recipient access by "protected_destinations"- Lets see below what I will put in "protected_destinations"? ]


Step 2. Edit and save the following in

# vim /etc/postfix/protected_destinations

    xyz@domain.com   insiders_only
    

[How do postfix knows insider_only?? It has been declared in main.cf with "smtpd_restriction_classes" after that I defined the "insiders_only" in postfix by "/etc/postfix/insiders".]


Step 3. Now input /etc/postfix/insiders

# /etc/postfix/insiders

   domain.com                      OK       ###matches my.domain and subdomains
   anotherdomain.com        OK       ###matches another.domain and subdomains


Step 4. Now create .db for new files with following commands.

# postmap /etc/postfix/insiders
# postmap /etc/postfix/protected_destinations


Step 5. Restart the postfix service.

# /etc/init.d/postfix restart






Now mentioned Mail ID  cannot received any mail from mentioned Domain   :)

Comments

Post a Comment

Popular posts from this blog

Squid Configuration

#apt-get install squid Minimum Configuration:                    edit      http_port 8080   acl localhost src 127.0.0.1/32 acl to_localhost dst 127.0.0.0/8 add      acl our_network src 192.168.200.0/24   In the part “ # Recommended minimum configuration:”   add       http_access allow our_network http_access deny all   save & exit (Esc+Shift+:wq!) # /etc/init.d/squid restart
Read more

Squint Configure

1.       Download actual version of squint and extract it: http://www.ledge.co.za/software/squint/ wget www.ledge.co.za/software/squint/squint-0.3.18.tar.gz 2.       tar – zxvf squint-0.3.18.tar.gz         3.        cd squint-0.3.18            ##To see installation steps --- more INSTALL   ### 4.       cp squint.pl squint.cron.sh /usr/local/bin/ 5.         cd /usr/local/bin# restart squint.pl squint.cron.sh squint.cron.sh init 6.       squint.cron.sh all 7.       squint.cron.sh regen 8.       Now Edit BASEDIR=”/var/www/localhost/htdocs/squint”          ### unhash this Line and Changed to >             BASEDIR=”/var/www/squint/”              LOGDIR=”/var/log/squid”      ### UNHASH THIS Line           HTTPDCONF=/etc/ apache2 /httpd.conf        #### add apache2   :wq! 9.        squint.cron.sh all 10.    vim /etc/crontab Edid time to required restart squint 11.    /etc/init.d/cron restart Now Squint is ready to
Read more

Postfix SASL authentication with SMTP port 465:

  By default postfix SMTP works on 25 port.   You can check this by following command with the output below: #netstat -nat tcp        0      0 0.0.0.0:25             0.0.0.0:*               LISTEN    Here we will change the port to 465 with SASL authentication. It is useful technique to fight against spam. Users those travel here and there with their laptops need not to change their e-mail client software settings also. Here is how we can do it.   Step 1 . Edit the file /etc/dovecot.conf and make sure your auth default section has the lines below. auth default { socket listen {   client {    path = /var/spool/postfix/private/auth    mode = 0660    user = postfix    group = postfix     }   }   mechanisms = plain login } Step 2 . Edit /etc/postfix/main.cf , find the keys below and change its values as follows or add it at the bottom of the file if the key (the word before the = sign) cannot be found. mynetworks = 127.0.0.0/8 smtpd_sasl_type
Read more

How to Change the Logo from Zimbra Admin Console

Image
To get a professional look, most of Mail Server Administrator wants to change the default Zimbra logo. Today I am going to show how to replace the Zimbra logo with  your own company logo.   Step:1 Firstly, logo size has to change as specified here, otherwise the image may not display correctly. ·          300x48 pixels (Login screen) ·          200x28 pixels (Zimbra interface, top left corner) Step: 2 Rename the logos as follows. LoginBanner_white.png AppBanner_white.png Step:3 Go to the Logo directory on zimbra and rename the existing default logos as backup: root@hmail:~# su zimbra zimbra@hmail:~$ /opt/zimbra/jetty_base/webapps/zimbra/skins/_base/logos$   LoginBanner_white_back.png AppBanner_white_back.png Step:4 Upload your own company images on Logo Directory and change the ownership permission of the images zimbra@hmail:~$ chown zimbra:zimbra LoginBanner_white.png zimbra@hmail:~$   chown zimbra:zimbra AppBanner_white.png   Yee!! Now refr
Read more