e-If! (with thanks to Mr Kipling)  The original by Rudyard Kipling (Author of The Jungle Book & so much more).
If you get scammed by spam when all about you                                              
Have firewalls to filter out the crooks.
If led astray by men who seek you out, you
Prove the dupe of those who’d cook your books.                            
If you rush in instead of hesitating,
Because the email had you hypnotised,
And take the hook the conmen have been baiting,
For greedy fools who’ll reach to grab the ‘prize’.

If you get scammed – and still believe the bastards,
Accepting without question what they claim
Until you meet with Internet disasters
When someone clones your credit card and name.
Or wait in vain for dodgy goods you’ve ordered,
From swine who weave a tangled web for fools,
Suspecting, if they ever cross the borders,
The thoroughbreds you ordered will be mules.

If you can make one pile of all their winnings
And post them in one cheque – and damn the cost,
Lose all, and find it hard to keep on grinning,
Resenting every cent and second lost.
If you approach the customs or the coast guard
To save the day when all your money’s gone
Yet never hear a word nor get a postcard
And wish you’d listened when advised “Hold On!”

If neither gold nor glitz can tempt or hurt you,
Nor fantasies of fortune make you dense.
If you can skip past scams and keep your shirt, you
Might at last develop common sense.
Then, you could find the unforgiving minute
Is no more costly than your broadband time.
Enjoy the web, but don’t trust all that’s in it
Then, if you’re lucky, you’ll be safe on-line.
 
If you can keep your head when all about you
Are losing theirs and blaming it on you;
If you can trust yourself when all men doubt you,
But make allowance for their doubting too;
If you can wait and not be tired by waiting,
Or being lied about, don't deal in lies,
Or being hated, don't give way to hating,
And yet don't look too good, nor talk too wise:

If you can dream -- and not make dreams your master;
If you can think -- and not make thoughts your aim;
If you can meet with Triumph and Disaster
And treat those two imposters just the same;
If you can bear to hear the truth you've spoken
Twisted by knaves to make a trap for fools,
Or watch the things you gave your life to, broken,
And stoop and build 'em up with worn-out tools;

If you can make one heap of all your winnings
And risk it on one turn of pitch-and-toss,
And lose, and start again at your beginnings
And never breathe a word about your loss;
If you can force your heart and nerve and sinew
To serve your turn long after they are gone,
And so hold on when there is nothing in you
Except the Will which says to them: "Hold on!"

If you can talk with crowds and keep your virtue,
Or walk with kings -- nor lose the common touch,
If neither foes nor loving friends can hurt you,
If all men count with you, but none too much;
If you can fill the unforgiving minute
With sixty seconds' worth of distance run --
Yours is the Earth and everything that's in it,
And -- which is more -- you'll be a Man, my son!