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All emails are being sent using email@example.com.
How do I change them to "Opsview Master <firstname.lastname@example.org>" ?
I would recommend you use postfix canonical address mapping. Two useful guides are here:
The basics are to edit main.cf and add a reference to the map file:
sender_canonical_maps = hash:/etc/postfix/canonical
Then edit the /etc/postfix/canonical file and add the remappings:
Run the command:
Then restart postfix.
How do I add the name "Opsview Master"?
The name should be taken out of the GCOS field in /etc/passwd for the user
I'm receiving an "empty" name.
meaning the sender is "email@example.com",
not "Opsview Master <firstname.lastname@example.org>".
Following is my /etc/passwd:
Can you post all of the email headers here? I am currently wondering if the 'nagios' user is the correct account to modify as it might be send from root when using sendmail directly - the email headers may help show this.