The connection to eGate failed because the the sender’s address is unknown to the system. eGate is a closed system and allows communication between partners with known addresses only (whitelist). Some eGate gateway users have providers who add a dynamic prefix to the sender’s address to fool spam filters. (This method is called Bounce Address Tag Validation, BATV in short.)
Example: prvs=1234ex567=edi@testaccount.de
Example: bouncemgmt=155773=edi@testaccount.de
On eGate, only edi@testaccount.de is known as the sender’s address. In fact, this address is used as the senders’ address, but because a prefix (different each send action) was added to it, eGate still rejects the message.
eGate does not support BATV, please change your application.
(eGate notification: Info:Message rejected, unknown sender: bouncemgmt=155773=edi@testaccount.de)
