Every day you send and receive so many even more hundreds of emails, however, you actually do not know whether they come to your targeted customers or not. Therefore, Magento 2 SMTP Extension is come out as the solution for this problem. SMTP Extension for Magento 2 helps the owner of store simply install SMTP (Simple Mail Transfer Protocol) server which transmits the messages into codes or numbers. Through it, messages will be delivered directly and automatically to the chosen customers. Moreover, it is also flexible configurations with 21 different SMTP servers such as Gmail, Hotmail, O2 Mail, Office365, Mail.com, Send In Blue, AOL Mail Orange, GMX, Outlook, Yahoo, Comcast, or Custom SMTP - own SMTP server, etc.