On 1/16/2014 7:28 AM, Premjith R wrote: > Hello Postfix User List, > > MX record for our domain points to dyndns.com, where upto 50 MB > messages are received. From dyndns setup is to push mails to a > zimbra (postfix) server inside the corporate firewall, where in > message limit is set to 5MB. > > When incoming messages are more than 5MB, we are expecting some kind > of notification - it can be bounce notification, email to admin or > logging of such actions. Can you help, how to setup this? Or where > in postfix logs can we look for error notifications?
You need to fix this. The MX must not accept mail the internal server will reject. There is likely no indication in your log that there's a problem. The sender will get a bounce notice; the recipient will never know. During the SMTP handshake, your system announces the max mail size. The sending MX sees that the message is too big and disconnects without attempting to send the too-big message. Nothing in your log except a normal connect and then a normal disconnect. -- Noel Jones
