a fake sendmail script for testing mail related applications, can replace /usr/sbin/sendmail

fake_sendmail.sh

#!/bin/sh

# Source : https://github.com/Sanchiz/fake_sendmail.sh

prefix="/home/USERNAME/sendmail/new"
numPath="/home/USERNAME/sendmail"
 
if [ ! -f $numPath/email_numbers ]; then
echo "0" > $numPath/email_numbers
fi
emailNumbers=`cat $numPath/emailNumbers`
emailNumbers=$(($emailNumbers + 1))
echo $emailNumbers > $numPath/emailNumbers

name="$prefix/letter_$emailNumbers.eml"

while IFS= read line; do
  echo "$line" >> $name
done

chmod 777 $name
/bin/true

gistfile1.sh

#!/bin/sh

# chmod 666 /var/mails.txt
# all mails will be stored in this file
MAILS_FILE='/var/mails.txt'

while read x
do
    echo $x >> $MAILS_FILE
done

echo "----------------------" >> $MAILS_FILE
echo >> $MAILS_FILE

exit 0