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What is an SMTP server ?

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The acronym SMTP stands for Simple Mail Transfer Protocol, the procedure behind the email flow on the internet.
What happens when you send out an email? The process of email delivery is actually quite similar to classical mail: an organized system takes care of your envelope and through a series of steps it drops it off to your recipient.
In this process, the SMTP server is simply a computer running SMTP, and which acts more or less like the postman.
Once the messages have been picked up they are sent to this server, which takes care of concretely delivering emails to their recipients.
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