Jeroen, Thanks, the way I see it is that the remote SMTP server rejects the message, so my local SMTP server is generating this bounce message to notify the sender.
So, if I am sending a message that has invalid recipient address or the message exceeds limit, there is no way not getting these mandatory bounce messages. What I could configure is whether anyone else (such as postmaster) should be notified such bounce message, which is what "notify_classes" configuration for? That is in addition to notify the sender via bounce message. Is my understanding correct? Thanks, Yan Confidentiality Notice: The information contained in this electronic transmission is confidential and may be legally privileged. It is intended only for the addressee(s) named above. If you are not an intended recipient, be aware that any disclosure, copying, distribution or use of the information contained in this transmission is prohibited and may be unlawful. If you have received this transmission in error, please notify us by telephone (513) 229-5500 or by email (postmas...@medplus.com). After replying, please erase it from your computer system.
