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The format to send mails is a bit tricky. The general invocation syntax is:

<process generating mail text> | mail -s "<Subject line>" <recipients address>">

So, for example, if you want to send...

awk ' /^$/ { t++; next }
!t { print > "file1" }
t { print > "file2" }
' INPUTFILE

Then, perhaps you should use paste (https://www.unix.com/man-page/OpenSolaris/1/paste/):

$ paste -d" " a.txt b.txt
A B C 1 2 3
D E F 4 5 6