Just be aware that many users end up complaining about hidden items in
their Outbox getting stuck and repeatedly resending on every mail poll.
Outlook will hide outbound read receipt e-mails so you cannot delete
them using Outlook's user interface. You have to use special tools that
dig into the message store, like OutlookSpy or Microsoft MDBVU32.exe.
Unless you are intimate with how Microsoft's message store is
constructed, you'll get lost in these tools without instructions.
Unless you are in an corporate environment that enforces read receipt
tracking to be enabled (automatic or prompted), you might want to
consider configuring Outlook so it is set to Never (i.e., never send a
read receipt and don't even bother to prompt you about the request).
If you are going to configure Outlook to prompt you as to whether or not
to send a read receipt when you get such a request, and because you are
sending a new e-mail back to the user, you could just reply to the
e-mail to say that you got it. This will obviate the tracking that
Outlook provides regarding read receipts to the original e-mail but then
using read receipts is rather stupid because it rarely works unless a
policy can be enforced to leave this tracking option enabled, like at
your company. The vast majority of users are going to have read
receipts disabled, or configured to prompt them and they rarely say Yes
to send the new e-mail that is the read receipt. There are even spam
filters that will extract the header added to request a read receipt so
the recipient's e-mail client won't even know that the sender had
request a read receipt. For security, a company should always be
stripping out the read receipt header from inbound e-mails that
originate from outside senders (so read receipt request can only be
submitted between their employees). Read receipts are highly unreliable
to let a sender know that a recipient read the sender's message.
The only time that I enable read receipts is within a company
environment (i.e., at work) and only if required by company policy.
However, company policy would also require that everyone is responsible
for all company-related e-mails that they receive. The employee is
responsible to read their company e-mail so read receipts are
superfluous because the employee cannot use the excuse that they didn't
read their e-mail. Since Exchange is likely used in a corporate
environment, verification that an e-mail arrived in a mailbox is
possible without using the daily and repetitive nuisance of read
receipts on those few occasions where, say, a manager wants to check
that an employee got an e-mail.
