You should disable images in mails by default (the way gmail does it) or at least add an option for disabling them. Images are usually used to track if and how

You should disable images in mails by default (the way gmail does it) or at least add an option for disabling them. Images are usually used to track if and how many times you read the mail. You're also missing the chat. As for your question. I would not consider switching from gmail or paying money for an email client.