This simple guide, with reassurance from career coaches and email etiquette experts, will make you feel confident about emailing just about anyone. Is this a friend? A teacher? A university contact?

"I sent my son's kindergarten teacher a cutesy little email saying, 'I'm sorry. Based on the stress, mental, physical anxiety ...

It's not unusual for an email to go unnoticed. It's also not unusual for an email to go unanswered. But how long is too long ...