Change standard words in subject of Domoticz email error messages

[Zoekm]

When Domoticz sends me an email due to a system error like for example: "Domoticz: 2017-11-23 11:00:06.369 Error: Error writing automatic daily backup file", I can not see from which of the 3 used RPi's that I use for Domoticz, the message is send. Is there a way to change the subject to for example:
"Domoticz RPi #1: 2017-11-23 11:00:06.369 Error: Error writing automatic daily backup file"?

And another question, is there a way to receive these system error messages by Prowl, without creating extra scripts?