Businesses communicate with clients and partners through emails and just because they send out mails in bulk, most of them use SMTP or Simple Mail Transfer Protocol mail servers. SMTP servers help in sending out mails in a quick and cost efficient way. The configuration of SMTP authentication is important so that the problem of spamming does not occur. Here is an explanation stating how authentication works and why it is necessary. Take a look at the mechanics of SMTP authentication.
How does authentication function?
SMTP authentication is required when the email is sent. When an email is being composed, one needs to provide the correct password and email address to authenticate the email. When you send out the mail, ISP checks the destination of the email and then relays the mail to the recipient’s mail server. This is called SMTP relay or simply, email relay. Basically what happens is that SMTP authentication checks if you are allowed to send email from that account.
Why is SMTP authentication needed?
From the explanation already given, it is clear to us, that to send an email one has to provide a legitimate password and email address. On a web server, things are a little different. Servers usually have SMTP enabled on it by default and a local host is used. However, local host SMTP does not need any authentication. This is a huge problem because by simplifying the programming, we also allow people to misuse the service. Some people may use the service for sending bulk mail and in the process they might even spam. With this, not only will the server slow down but it might also get blacklisted for spam by leading ISPs and the other users of the server won’t be able to send out emails anymore.
This problem is perfectly solved with SMTP authentication. Bulk email SMTP servers should have it installed so that the server cannot be misused and spam mails aren’t sent out. With authentication, the user is required to give the right SMTP identification in coding. This way the mail sent out will be sent via real email servers. This way you will have to abide by strict rules, daily quotas and spam filters. So basically, SMTP authentication protects both, the mail server and the web. This is the reason why hosting providers these days, don’t allow the use of local host SMTP. Authentication allows the reputation of the server to stay shielded.