Postfix can be configured to prevent email senders from using an email address that does not belong to them. This article describes how to configure the sender restriction in Postfix to prevent senders from spoofing email addresses.
smtpd_sender_login_maps = pcre:/etc/postfix/sender_login.pcre smtpd_sender_restrictions = reject_authenticated_sender_login_mismatch
If you have a different map file, specify it in the smtpd_sender_login_maps line.
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Posted on 4/30/2010 and last updated on 5/22/2010
Filed under Postfix