@Anoop,

Mutt supports various attachment types, including binary files and printable ASCII characters. However, the encoding method you choose can impact compatibility and ease of use.

Here are a couple of suggestions:

1. The -a flat is used to attach files to an email, but if you are facing issues with Base64, you might consider explicitly specifying the encoding using the -e flag.

mutt -a file.txt -e "application/octet-stream"

2. Since you mentioned that uuencode is working without difficulty, you can consider using it as an alternative encoding method for your attachments. Adjust your Mutt command accordingly:

mutt -a file.txt -e "application/octet-stream" -- -x 'uuencode %s %s'

mutt -a 

viz. binary files, printable ASCII characters, or both. I am facing an issue with Base64, however with uuencode not facing any difficulty.

I have a constraint for not applying the BASE 64 package in my AIX machine.

No, the mutt email client will not work with two-factor authentication.