The Importance of SMTP in Email

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Most email clients use SMTP, and without it senders would not be able to send email to anyone outside their own domain.

This is because the email is converted into hotel email list code when you press the send button, and SMTP analyzes the code and delivers it as an email.

SMTP also helps to prevent spam by checking whether emails are sent from valid accounts.

SMTP also serves the role of returning email to the sender if the email did not reach the intended recipient, informing the sender that the email address was incorrect or that the email was blocked by the recipient's server.

Conventional SMTP does not have the functionality to authenticate whether the sender's account is valid.

Subsequently, authentication features were added to prevent the spread of damage caused by spam, making it possible to exchange emails safely.

SMTP with authentication functionality is called "SMTP-AUTH."
For more information about SMTP-AUTH, see below.




What is SMTP-AUTH? Security measures for SMTP communication
"SMTP-AUTH" is one of the measures against spoofed emails. We will explain what "SMTP-AUTH" is and what it can do.
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What is SMTP relay? Sending and receiving emails between servers


As mentioned above, the sent email is forwarded from the sending server to the receiving server before being delivered to the recipient.

This process of one server receiving email from another server is called "SMTP relay."

Relaying does not occur when no other servers are involved, such as when exchanging email between the same domain.

To use a postal analogy, when you mail a letter to someone nearby, it is delivered directly to the address without going through any other post offices.



What is SMTP relay service? Email delivery service


SMTP relay is used not only for person-to-person communications, but also when companies send e-mail newsletters, direct mail, etc. to a large number of users at once.

Most Internet providers provide mail servers that limit the number of SMTP relays that can be performed per day to prevent spam.

This makes it difficult to use existing providers to send emails to many users. A service that can help with this is the "SMTP relay service."

The SMTP relay service is a service that allows you to deliver large volumes of email at high speed by passing it through a reliable third party.

By using the SMTP relay service, you can distribute email newsletters, direct mail, and other mail to a large number of customers without being restricted by your provider.