Your From email address must be from your store's domain. When sending an email, it's important to have a unique domain that is relevant to your store. For this reason, domains such as Yahoo.com and Gmail.com are not permitted and will not be verified by Springbot as a proper From email address.
These domains specifically say that you cannot send multiple emails out on their behalf. This is to prevent email address spoofing commonly used in spam and phishing attacks. We encourage you to send from your own domain name as it improves your brand recognition and helps establish you as a legitimate email sender (which helps keep your emails out of the SPAM folder!)
If you don't have an email in your store's domain, you can create one using: