MS Outlook 2003 Error when reply/forward email of a delegated mailbox with signing and encryption

[Candy]

Hello all experts,

We are working on a project with Outlook 2003 and Exchange 2003.

Customer requires some mailboxes being delegated to others for daily
usage and signing and encryption are always required for emails
operation.

However, we got some problem on the following situation:
mailbox UserA is being delegated to mailbox UserB.

UserB open mailbox UserA and then try to reply one of its email.

by default, the sender is set to UserA and the security settings have
UserA's cert for signing and encryption. However, when send out the
email, the signature is signed by UserB's cert.

Then, we tried to explicitly change the security setting to UserA's
cert again for signing and encryption. When send out the email it
prompts
‘Microsoft Office Outlook could not sign or encrypt this message
because your certificate is not valid'

If before sending out the email, we cleared the From field and
re-typed UserA, the email can be sent out and signed using UserA's
cert SUCCESSFULLY !!


Our customer is hurrying us to provide solution for this problem ...

Can anyone tell me what's wrong with it ?
Is it actually a bug in Outlook2003 ? Any fixes ?

Thank you very much !!!!
Regards,
Candy

 

[Marli]

This seems to be not just an Exchange or encryption
problem. In my home office, I use 1 Outlook 2003 and 2
OE6 ids. The OE6 ids are forwarded to my Outlook 2003. In
Outlook 2003 I can reply to 1 id with no problem. The
other fills in my Outlook 2003 id. I tested this within
the faulty OE6 account using reply function with a Sent
message both locally and web based.

M

 

[Candy]

seems that it is the outlook 2003 problem ?!

in my case, userA and userB are in the same Active Directory and
Exchange Server 2003.

If create a new email, since user will need to type userA or userB in
the From field, so seems not problem.

However, if reply/ forward email of the delegated mailbox, then will
need to clear the From field and type the name again such that can
send it out with correct signature.

Anyone know the cause too ?

thank you very much !!
Regards,
Candy