Setting Up Postfix (Linux)

With Postfix, you can manage your IONOS email accounts securely under Linux.

Please make sure that the following modules are installed on your computer in addition to Postfix in the case of SuSE Linux:

Postfix 1.x

• postfix-tls
• libsasl-modules-plain
• sasl-bin
• ibsasl-digestmd5-plain

For Postfix 2 you only need the following packages:

• cyrus-sasl
• postfix

Step 1

Edit the configuration file /etc/postfix/main.cf as follows:

/etc/postfix/main.cf

relayhost = smtp.ionos.com:587
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps =  hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous 
smtp_use_tls = yes

Step 2

If it does not already exist, create the file /etc/postfix/sasl_passwd and enter the access data for your mailbox as follows:

/etc/postfix/sasl_passwd

smtp.ionos.com mail@example.com:mypass

Please replace our example information "mail@example.com" and "mypass" with the IONOS email address and the corresponding email password.

Step 3

Now you should change the access rights so that only "root" can view and edit the file. You do this with the command

chmod 600 /etc/postfix/sasl_passwd

The permissions should now look like this:

-rw------ root root

Step 4

Convert the file to the.db format used by Postfix:

postmap /etc/postfix/sasl_passwd

and restart Postfix:

/etc/init.d/postfix reload