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Which ones are correct:

'Hi All' or is it 'Hi all'. (A)ll does not look right

'Hi Peter/John' or 'Hi Peter, John' when you want to specifically address the e-mail to two people, i.e. so they clearly know they are the main addresseess and appear in 'to' and all the rest, if any, are in the 'cc'.

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Why do you think the all needs capitalization? Because it replaces 'Peter, John, Paul,' etc.,? :) Compare: 'Dear Uncle,'. – Kris Dec 14 '13 at 7:19
What's addresseesses, Precious? – Edwin Ashworth Dec 14 '13 at 8:25

There's no need to capitalise because 'all' is a common noun.

In the UK it's still more common to use a '/' or 'and' than a serial comma when addressing more than one person in an email. But then names are sometimes omitted entirely.

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