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How email's mostly used now is way different from how it originally worked. SMTP used to be something email servers used to push email to other email servers, not something clients used.

Client A...

bash most definitely is not /bin/sh except by coincidence on some systems. If you're using bash features, use #!/bin/bash, not #!/bin/sh. On some systems this difference is vital.

No, just a ksh substring feature, using file globbing wild cards with meta characters '*', '?', '[...]' but not '[^...]', not regex. It says get the value of animal and chew the end aggressively so...

for ssh I use puTTY its easier..

The shell always interprets the $ prefixed names as variable, and in your current shell you may not have a variable N, so you will get null being replaced for $N and this code will be sent trough ssh...

Try this:

cat <<EOF
for N in 1 2 3
do
echo VAR:$N
done
EOF
You get:
for N in 1 2 3
do
echo VAR:
done because $N gets substituted before the text is even printed! You...