How to configure Zimbra to bounce/notify email to sender due to over attach size from external mails like Gmail, Yahoo, etc..
I am using Zimbra open source edition. Undelivered mails are not bouncing to the sender for higher message size / attach size.
There is an extended Wiki entry on the Zimbra Support Site that explains this in detail.
http://wiki.zimbra.com/wiki/Configuring_maxmessagesize