Internet mail failure messages

Hi, we have a problem on a Notes 6 server that is acting as an SMTP gateway. The incoming mail is restricted to 5 mb. I assumed that if an incoming mail was too big then a failure message would go to the sender. We have just had a very angry customer demanding to know why he has had no response to his email. Of course the email did not get in, but he didn’t get any notification of this. We have tested it with several other users and it is the same situation in all cases. I cannot find anywhere in the config doc to set this, should this be the way Notes works by default? And if so, why are the failure notifications not being sent? I would be really grateful for any suggestions, especially as we now have to provide a justification to the customer, Thanks Anne

Subject: As far as I know,

the return message should be sent without problems. I’ve been testing this for a customer with similar complaints, recently. In his case, it turned out the messages were killed by an incoming SMTP server sitting before the Domino server.

In another similar case it was a bit more difficult. In this case, the senders’ SMTP server has no limit on outgoing messages, but a limit of 5 MB on incoming mail messages. This sender sent out a 12 MB attachment, wich was refused at my customers’ server wich has a 10 MB limit on incoming. So my customers’ server tries to return the 12 MB message to the sender, but now it’s refused by them, because they have a 5 MB limit on incoming messages! And so the message ends up dead in my customers’ mailbox. This has happened several times. I don’t understand why some SMTP admins don’t have the same limit on outgoing as they have on incoming messages…