Adding DKIM to Postfix

DKIM on Postfix:

The configuration can be tested by sending an empty email to and a reply will be received. If everything works correctly you should see DKIM check: pass under Summary of Results.

Summary of Results
SPF check: pass
DomainKeys check: neutral
DKIM check: pass
Sender-ID check: pass
SpamAssassin check: ham
Alternatively, you can send a message to a Gmail address that you control, view the received email’s headers in your Gmail inbox, dkim=pass should be present in the Authentication-Results header field.

spf=pass ( domain of designates — as permitted sender);