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Sendmail message size

I am trying to calculate how many MB of mail there has been sent to a domain. In the sendmail log i grep for all the "size=" lines. But when i add them up i get to 5078658 kb. This is way to much.

What am i doing wrong this time?

i typed this from command line:
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grep "Jan 15" /var/log/maillog|grep "from="|grep -v domain.nl|grep -v "to="| awk '{ print $8 }'|sed -e "s/size=//g"|sed -e "s/[,]//g" > /root/mailsize
----

And this as a little script:
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#!/bin/bash
aantal=$((0))
cat mailsize | while read line; do
aantal=$(($aantal + $line))
echo $aantal
done
----

Shouldn't that be bytes? (Cap b, lowercase b being bits, 8 bits in a Byte): Bytes / 1024 (KBytes) / 1024 (KBytes): "echo 5078658 / 1024 / 1024 | bc -l"

Code:

size_t=0; cat /var/log/maillog | grep "from=" | grep "size=" | cut -d "=" -f 3 | cut -d "," -f 1 | while read size_m; do size_t=$(expr $size_t + $size_m)

echo "aprox  $(echo $size_t / 1024 / 1024 | bc -l | cut -c 0-3) MB"

echo "aprox  $(echo $size_t / 1024 | bc -l | cut -c 0-5) KB"

echo "exactly $size_t Bytes"

echo "exactly $(echo $size_t \* 8 | bc -l ) bits"

done