English

Web-based so it's viewable anywhere, anytime on any device
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French

Never include the price in the email. Always give it it's own section in the proposal itself.
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German

The first thing they see when they open it should "WOW" them.
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Spanish

Your introduction should be personally written for them and address their real problem.
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Catalan

It should describe exactly what you're going to do for them.
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Italian

It should include undeniable proof from previous clients that you can do what you say you can do.
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Dutch

Attractive and relevant imagery.
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Croatian

They should be able to sign it online.
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Finnish

It should be sent to your client while it's fresh in their mind.
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