Symptoms

The ssmtp RewriteDomain setting is set to the empty string. Therefore, the From address in any email sent by the BIG-IP has an empty domain.

Impact

It is difficult to determine the originating device for system email.

Conditions

This applies when the 'sys outbound-smtp rewrite-domain' setting is unset.

Workaround

Set the 'sys outbound-smtp rewrite-domain' to the local hostname.

Fix Information

The ssmtp RewriteDomain setting is no longer set to the empty string. If 'sys outbound-smtp rewrite-domain' is unset, no rewriting will occur and the From address will have the hostname as its domain.

Behavior Change