Is there some way to link a Contact with an email account (i.e.. one of my
email accounts), so that when I send a email to a given Contact it will
always be sent from the email account designated for that user.

I have 3 email accounts - one is for personal use, another is for my small
business use and the third relates to an organisation, of which I'm the
secretary.

I want to make sure that my family and friends always get email from my
personal email address ", my business associates
always get email from my business email address
" and my fellow directors always get email
from the organisation email address "

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"Man who says it cannot be done, should not interrupt man doing it." -
Chinese proverb