I think when we use send mails funtions in programming launguges like in node,php,java or any backend launguage we use smtp server.we dont have application for send a mail still we send it,i did it using node js it’s easy you can also try.but recipent address should must
ex : https://stackoverflow.com/questions/14456673/sending-email-with-php-from-an-smtp-server
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