[Solved] How to configure postfix to authenticate over starttls at relayhost?
Hello all,
I could use some help with the configuration of postfix. I have to configure postifx to use SMTP Authentication when sending mails to a relayhost. The relayhost itself offers the following parameters:
telnet relayhost 25
EHLO localhost
250-relayhost
250-AUTH PLAIN LOGIN
250-AUTH=LOGIN PLAIN
250 STARTTLS
I would like to use STARTTLS to open a secure and encrypted channel and then transmit username and password for authentication.
Does anyone know a good tutorial or could explain how to do that?
Thanks in advance,
Joerg K.
Responses
Expert
1223 points
Well, after I walked through the valley of tears i finally found a solution on the web. For others who might struggle as well here is the solution for my problem.
- At first I checked if my user credentials worked while authenticating over starttls
- Secound I followed the guide SMTP Authentication for Mail Servers
- Adding
smtp_use_tls=yesabove the new block from step two - Installing cyrus-sasl and cyrus-sasl-plain on my machine
systemctl reload postfix.service
Step 4 brought the solution. Because I did a minimal installation these to packages were missing. After installing them the setup works as expected.
In summary with installing the two packages from step 4 I've added the following lines to my main.cf:
# SASL SUPPORT FOR SERVERS
#
# The following options set parameters needed by Postfix to enable
# Cyrus-SASL support for authentication of mail servers.
#
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options =
Yeah! \,,/
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