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The exclamation mark is used after an interjection, an exclamatory sentence or an expression of great feeling. It is therefore used to express a sudden moment of passionate feeling, whether this be surprise or joy. It is generally over-used in social letters and should be avoided when not strictly necessary. Do not use an exclamation mark without first asking yourself: ‘Does this sentence really deserve one?’

Too many exclamation marks in any piece of writing trivialise it by making it seem hysterical.

It can, however, be very useful if you are making a statement that might be considered a little forward when addressed to people you do not know very well. It can make written text seem more relaxed and informal.

I had a really marvellous time!

Thanks for the toy rocket!