I have come cross problem that people cannot reply to my emails that has attachments. It doesn’t happen with all the recipients. After bit or research it happened not because of my settings but with their settings.
How to solve cannot reply to emails with attachments in outlook 2003.
If you have a problem replying or forwarding email that you received in your outlook 2003 you might able to solve it by uncheck the “close original message on reply or forward” which you can find in
(Select)Tools > (Select) Options > Preferences (Tab) > (Click) Email Options (Button).
Then uncheck “close original message on reply or forward” checkbox if it is checked. This should solve your problem.