I know there are a couple of threads about this issue, but no-one seems to have a bullet-proof answer.
In our exchange setup we have an account intended to be used by temps as a single email address point - ie it is job based not person based. When a temp arrives they are given their own AD & Exchange accounts to access the network, and permissions are given for them to have full access to the job email account. Their outlook profile is setup so that the job exchange account is the primary account, and their personal email address is opened as an 'additional mailbox'.
Our current temp can not send from the job email account - internally or externally. There are no logs in exchange for the job account having sent the email and the error message is sent to the temp's personal inbox. Copy of the full text of the message below:
From: System Administrator
Sent: 06 November 2008 11:04
Subject: Undeliverable: RE: Permissions
Your message did not reach some or all of the intended recipients.
Subject: RE: Permissions
Sent: 06/11/2008 11:04
The following recipient(s) could not be reached:
IT Support on 06/11/2008 11:04
You do not have permission to send to this recipient. For assistance, contact your system administrator.
There are no error codes in the message. We use this setup elsewhere in the organisation quite sucessfully and so far as I can see by making comparisons - permissions are correct. If anyone can shed any light or suggest where else to look it would be much appreciated.