Modern private postal systems are typically distinguished from national postal agencies by the names "courier" or "delivery service".
The easiest way to start a conversation with anyone new is to ask a question, so include one.
So, “You looked like you were having a blast on your skiing holiday! Where would you most like to go skiing that you haven’t been yet? One hundred words is about right: long enough to include a compliment, to say what caught your eye about their advert, mention something you have in common, and to ask a leading question.
Don’t feel you have to sell yourself or introduce yourself too much – as we’ve said, they’ll definitely visit your profile and read about you there. Plus, the shorter your first email, the more intriguing you’ll be. You might say you’re busy and leading a fun, full life, but if you’re sending emails at 9.00 on a Saturday night, how busy can you be..?
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A postal service can be private or public, though many governments place restrictions on private systems.