Empty “From” in agent notificati on mail

Hello Everyone,
I am currently facing the problem that new ticket notifications are sent
with an empty from field:
Here is a snippet from the maillog:
Aug 16 14:02:35 <hostname> postfix/pickup[24168]: 37B8B3E0049: uid=48
from=<>
Aug 16 14:02:35 <hostname> postfix/cleanup[26582]: 37B8B3E0049:
message-id=<redacted>
Aug 16 14:02:35 <hostname> postfix/qmgr[16018]: 37B8B3E0049: from=<>,
size=3974, nrcpt=1 (queue active)

Here is the line from the otrs log as  displayed in the frontend:
Sent agent 'NewTicket' notification to '<address>'.


I'm using OTRS-4.0.5, could this be a bug with this old version or is this
a configuration error?


Greetings

Martin Merfort

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