is to use the mail relay of your ISP.
We host our mailserver internally at our office. Therefore we are sending emails from an dynamic IP range of our ISP. Usually these IP ranges are identified as spam hosts by pages like spamhaus.org.
To avoid this problem you can send out email via the (usually provided) mail relay (smtp auth) server of your ISP. To get this done you need to attach your Postfix to the mail relay as explained in the next lines:
Our ISP is 1und1 – so the process is the following:
# using 1und1 as a mail relay
relayhost = smtp.1und1.de
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
Try sending an email…
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