No you can not. According to Temp Mail FAQ, TempMail does not give to its users the possibility from email address generated by Temp Mail. They don’t plan on adding this feature in the future, and they fear it is used for SPAM and fraud purposes. Thanks to SimpleLogin's reverse alias, you can reply and send emails from your alias. SimpleLogin also has security processes to avoid sending and receiving SPAM or phishing attempts. Here is what their FAQ says: Sending email is completely disabled and we are not going to implement it due to fraud and spam issues.