Most people don't realise just how important the subject-line is as an attention graber. I liken it to the impression you make when you walk in to a crowded room which in this case is a bulging inbox.
Good subject-line is key to saving time and effective email etiquette.
On your request for an email when cornered on your travels. Very good point as it presumably serves to short the wheat from the chaff and those who really need you.
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