i have an exchange 2007 server (hub and edge server setup ) . recently i have been encountering issues receiving emails from GMAIL account with attachments =>1MB . the same attachments get through if sent from an hotmail account . User receives a delay email after around 12 hours which repeats for the next 2-3 days and then a permanent delivery error messages is received . someone suggested disabling Chunking on the receiver connector should resolve this issue but i do not have this to effect the current flow of the emails .
Please advice !
bounce back email sample :
This is an automatically generated Delivery Status Notification
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipient has been delayed:
Message will be retried for 1 more day(s)
Technical details of temporary failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain actionimpact.com by mail.actionimpact.com. [184.108.40.206].
The error that the other server returned was:
421 4.4.1 Connection timed out