All you need to know about an SMTP Server

The acronym SMTP stands for “Simple Mail Transfer Protocol”, which the procedure behind the email flow on the internet.
Ever wondered what happens when you send out an email? The process of email delivery is very similar to classical mail: there is an organized system to take care of your envelope and if follows a series of steps, it drops it off to your recipient.
The SMTP server is simply a computer running SMTP in this process. It acts more or less like the postman. Once the messages have been picked up they are sent to this server, which entirely takes care of delivering emails to their recipients.
The process of sending and receiving emails between the sender and receiver goes something like this:-
* You send an email with your webmail or mail client(recipient) from your address (e.g. raj@website.com) to a given recipient (e.g. suraj@domain.com)
* The message is usually sent via port 25 to an SMTP server (named for example mail.website.com) which is given to your client when you set it up and acts as a Message Transfer Agent or MTA. Client and server start a brief ‘conversation’ where the latter checks all the data concerning the message’s transmission (sender, recipient, domains,)
* If the domain where your recipient has his account is directly connected to the server, the email is immediately delivered. If it’s not the case, the SMTP Server hands it to another incoming server closer to the recipient. In our example, the Website server connects with the Domain server, which receives the email and stores it.
* What if the recipient’s server is down or busy? The SMTP host drops the message to a backup server: if none of them is available, the email is queued and the delivery is retried periodically. After a determined period, however, the message is returned as undelivered.
* If there are no issues, however, the final segment is controlled by POP, another protocol that picks up the email from the receiving server and puts it into the recipient’s inbox.
It should be highlighted that the SMTP servers used when you send your ‘normal emails’ , are shared among users and they are based on non-dedicated IPs. Which means that you could end up to rely on an IP that is also used by a spammer: a fact that will negatively affect the correct delivery of your messages. Also, common providers establish some strict limits on the number of emails you can send

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