thanks for your fast reply. I will try to explain the problem we have,
our customer has ACS 22.214.171.124 and uses csmon to send email notifications. All worked well until he changed the recipient mail address to a new one.
Since this minor change the csmon nnotifications will be blocked by the mail server because of an unsupported format.
normally he received the mails with csmon@auth5 where auth5 is the name of the ACS after changing the recipient mails will arrive at the mailserver with email@example.com where 126.96.36.199 is the ip address of the mailserver. It is crazy, isn't it?
DNS resolution still works well on ACS(also Reverse Lookup). Have you got an idea?
In latest versions (4.x), the From field or the Mailsender is derived from the SMTP server name configured on the service management page.( i.e. mail comes from csmon_alert@ (SMTP mail server configured) .And this is not configurable.
When you upgrade from 3.3 to 4.x versions, you will see that the Mailsender configuration is retained as the server hostname ( csmon_alert@ . ) So restoring the backup from the old server to new server causes the mailsender name to be wrong.
To return to the defaut 4.x behaviour (sender name as the SMTP server configured ), we need to just submit the "ACS Service management" page once.
So that is why after making a change, it started using smpt server name (default behaviour)
Login to the FXOS chassis manager.
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In Syslog I also se...