Rules E-Mails Sends "on behalf of" Instead "From" the set E-Mailadress

Hi,

I have a Rule wich triggers E-Mails to a certain E-Mailadress when a new Comment is made to any node.
I have set a particular sender e-mailadress to this mails in the rule settings. But this settings are not set for the sender address. This is what outlook users get:

From: username@host.tld [mailto:username@host.tld] On Behalf Of desired-senderaddress@correcthost.tld

Is there a way to set the from and mailto: address to the one specified in the rule settings form?

Best Regards,
Sandro