This question is from an administrative assistant who needs to forward mail for other people.
Is there any way to change the Reply To address or the From field so that the recipient doesn't reply to me and make me forward their response to the original sender? I don't need to be a delegate because I don't need to do anything other than have a list of emails I can choose from for the Sender of the message. Is this possible?
Sure it's possible. There are two solutions to this problem: you can use the Have Replies Sent To field in Message Options or have Send as or Send on Behalf of permission on the original sender's mailbox.
To use the Reply to address in Outlook 2010 and Outlook 2013, click the Direct Replies to button on the Options tab while composing the message.
Select or enter a different email address in the Have replies sent to field. When you use this field, the message will appear to come from you, but the replies should be sent to the address you entered.
Send as or Send on behalf of
If you want the message to appear to come from the person who asked you to forward the message, the Exchange administrator needs to give you Send as or Send on behalf of permission on the mailboxes.
Either permission can be given without giving full delegate permission but the Exchange Admin needs to set it up. When you send a message for the person, you'll type their name in the From field of the message.