Sometimes I take one week to answer emails. If I see the matter isn't important at all, it can take forever to answer. Maybe some mail goes lost, can't tell. B

Sometimes I take one week to answer emails. If I see the matter isn't important at all, it can take forever to answer. Maybe some mail goes lost, can't tell. But answering your question, no, it is not a problem to write someone if they publicly post their email addresses on their websites.