Learn more about ESMTP & SendMail from our experts. Our Sendmail Support team is here to help you with your questions and concerns.

ESMTP & SendMail

ESMTP is short for “Extended Simple Mail Transfer Protocol”. It is an extended version of the SMTP used to send and relay email messages over the internet.

ESMTP offers additional features beyond those offered by SMTP.

Let’s take a look at how it relates to Sendmail, a popular MTA.

SMTP is used for transmitting email messages between email clients and servers. However, the original SMTP protocol had some limitations. These include a lack of support for authentication, a limited set of mail header fields, etc.

Now, let’s look at some of the features offered by ESMTP:

• It supports different authentication methods. This allows email servers to verify the identity of the sender and prevent unauthorized use.
• It offers additional SMTP commands and parameters for more advanced functionality.
• Additionally, it offers support for MIME.
• It can transmit binary data directly.
• It allows longer messages than the original SMTP.
• ESMTP clients and servers can negotiate the maximum message size to avoid problems with oversized messages.

Sendmail is a popular MTA used on Unix-like operating systems. It supports ESMTP since its early versions. In other words, it makes it compatible with modern email standards and protocols.

Sendmail can act as both an ESMTP client and server. Hence, it allows it to send and receive email with ESMTP.

We can use Sendmail with ESMTP without any additional configuration. Sendmail automatically supports ESMTP features when communicating with other email servers or clients that also support ESMTP.

Furthermore, ESMTP is widely supported by modern email servers and clients.

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Conclusion

In brief, our Support Experts introduced us to using ESMTP with SendMail.