What Is an Outgoing Mail Server Hostname? Step-by-Step Guide


An outgoing mail server hostname is the address of the SMTP (Simple Mail Transfer Protocol) server that your email application uses to send emails. It is usually written as a domain name such as smtp.gmail.com or smtp.office365.com, and it tells your device where to connect when delivering outgoing messages. Without the correct outgoing mail server hostname, your emails cannot be sent successfully.

Now let’s explore what this means in detail, how it works, where to find it, and how to configure it correctly.

Understanding the Basics

When you send an email, your message does not go directly to the recipient. Instead, it travels through a mail server that processes and forwards it. That sending server is known as the outgoing mail server, and its technical address is called the hostname.

For example:

  • Gmail → smtp.gmail.com

  • Microsoft 365 → smtp.office365.com

  • Yahoo → smtp.mail.yahoo.com

The hostname acts like a digital street address for the server that handles outgoing email traffic.

Read More: What Is an Outgoing Mail Server Hostname?

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