Email Attachement Packet

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Good morning

I am new to wireshark and looking for some help to complete an assignment. We have to capture username and password and email attachment.

I can only seem to capture packets from my machine and have tried all sorts including making sure promiscuous mode is on, but I cant seem to capture packets of an email I am sending from another machine.

I have a windows installation of wireshark and can also access wireshark through Kalilinux.

I am using a wifi network.

I have been told that it has something to do with "bridging", but no clue how that works.

Any help provided greatly appreciated

Bobs