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Pass -o smtp.decryption:TRUE to tshark.

Example without the option:

tshark -T fields -e frame.number -e smtp.auth.username -Y smtp.auth.username -r crim.pcap
63      c25lYWt5ZzMza0Bhb2wuY29t
123     c25lYWt5ZzMza0Bhb2wuY29t

Example with the option:

tshark -o smtp.decryption:TRUE -T fields -e frame.number -e smtp.auth.username -Y smtp.auth.username -r crim.pcap
63      [email protected]
123     [email protected]