I have never used any HTML other than some really basic formatting ...
That's what makes this topic interesting. I've been developing web applications since 1999 and have only recently become concerned with HTML email. Perhaps I viewed it as the domain of spammers. But now we're getting requests for parental notifications when children are marked absent (perhaps they never arrived at school), when children fail to turn in homework. Notifications when students are admitted. Notifications when the school is closed by snow. Administrative notifications when "special education" students change their class schedules.
There may be dozens of processes within our system where email notifications may help.
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