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The code for mimesender can be found here (https://www.unix.com/answers-frequently-asked-questions/9417-multiple-attachments-post33233.html#post33233).

Have you tried specifying a body with -b...

You can if you make awk treat stdin as a regular file:
command | awk '...' file - > fileout
You could differentiate between the two by using NR==FNR or FILENAME=="-"

read is known to alter terminal settings in many shells. To guarantee you're getting a raw read with the terminal characteristics you set, try dd.

k="$(dd count=1)"

Also note that some...

@OP I think you have the input files reversed..
Alternative awk:
awk -F, 'NR==FNR{T[$1]=$2; next}$0=$2 FS $3 FS T[$1]' uno due > outtel
NAME1, LASTNAME1 ,4121234567
NAME2, LASTNAME2 ...

try it - just use plain awk

nawk -F, 'FNR==NR{f1[$1]=$2;next} $1 in f1 {f2[$1]=$2} END {for (i in f2) print f2[i], f1[i]}' OFS=, uno due