People are replacable. I've worked in countless companies where a tech lead or an important person that seemingly keeps the whole ship floating leaves, and the

People are replacable. I've worked in countless companies where a tech lead or an important person that seemingly keeps the whole ship floating leaves, and the company is ALWAYS fine after. This urgent project might have done better without you. The company might royally fuck it up. You shouldn't feel guilty for leaving a company, because a company certainly won't feel guilty if they had to get rid of you. Like others have said, these are the sort of conversations that are best had face-to-face. There are countless reasons as to why they've not emailed back, but personally I wouldn't dwell on it. I'm sure they'll be fine, and I'm sure you will be too.