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I try it ok in FreeBSD:-)
1.)/usr/bin/echo "Email text\nNew line\nAnother new line" >x

2.) uuencode sourcefile.txt sourcefile.txt | cat x - | mailx -s "Email subject" "recipient@company.com"
...

A shell in crontab per 5 min write a file
B shell in crontab per 6 min read a file
how to lock the share file a ;avioid confilict in write and read?
Thx : -)