We have a single Exchange 2010 Enterprise server. There is a requirement to archive any emails to and from one customer - (i.e. by sender/recipient domain) so that messages are duplicated in a tamper-proof location. In other words, this must be a copy of all messages sent and received and must be read-only.
Is this possible within Exchange 2010 Enterprise? If so, how? I know that it's possible to set up an archive mailbox but this can be altered, emails deleted, etc.
If not, what third party utility can meet the requirement?
Thanks in advance for any advice.