On-premise smtp relay to office 365

Does Office 365 allow SMTP relay?
What is the difference between SMTP and SMTP relay?
Does Office 365 SMTP require TLS?
What is the difference between Office 365 port 25 and 587?
How do I enable TLS 1.2 SMTP relay?
Does SMTP relay use TLS?
How to configure IIS for relay with Office 365?
Does Office 365 support TLS?
Is Google SMTP relay free?
Is not authorized to relay messages through the Office 365 email servers?
How to configure IIS for relay with Office 365?
How do I enable TLS 1.2 SMTP relay?
Is Google SMTP relay free?
Does SMTP relay require authentication?
What is 550 relay not permitted in o365?
What is 451 relay not permitted Office 365?
How to configure SMTP relay in IIS?
How to use port 587 for SMTP?
How do I send an email using SMTP relay?

Does Office 365 allow SMTP relay?

SMTP relay lets Microsoft 365 or Office 365 relay emails on your behalf by using a connector that's configured with your public IP address or a TLS certificate.

What is the difference between SMTP and SMTP relay?

Simple Mail Transfer Protocol (SMTP) is a straightforward process that allows users to send, relay, and monitor outgoing emails. An SMTP relay service—also commonly known as an SMTP gateway service—takes this a step further by allowing you to send more transaction and marketing-related emails.

Does Office 365 SMTP require TLS?

To provide the best-in-class encryption to our customers, Microsoft has deprecated Transport Layer Security (TLS) versions 1.0 and 1.1 in Office 365 and Office 365 GCC. However, you can continue to use an unencrypted SMTP connection without any TLS. We don't recommend email transmission without any encryption.

What is the difference between Office 365 port 25 and 587?

SMTP Port 587

Whereas port 25 is the recommended port number for SMTP communications between mail servers (i.e., for relaying messages), port 587 is the one recommended for message submissions by mail clients to mail servers.

How do I enable TLS 1.2 SMTP relay?

Type "Internet Options" and select Internet Options from the list. Click on the Advanced tab and from there scroll down to the very bottom. Confirm that TLS 1.2 is checked. If it is not, please check the box adjacent to Use TLS 1.2 and then Apply.

Does SMTP relay use TLS?

Requirements for Setting Up SMTP Relay

The sending application (the on-premises email server) must support TLS, connect to the Office 365 servers on port 587 (the SMTP port for Office 365 with encryption enabled), and authenticate with Office 365. A valid certificate must be used.

How to configure IIS for relay with Office 365?

Select Start > Administrative Tools > Internet Information Services (IIS) 6.0. Expand the current server, right-click the SMTP Virtual Server, and then select Properties. On the General tab, select Advanced > Add. In the IP Address box, specify the address of the server that's hosting the SMTP server.

Does Office 365 support TLS?

Office 365 supports TLS version 1.2 (TLS 1.2). TLS version 1.3 (TLS 1.3) is supported by some of the services. Be aware that TLS versions deprecate, and that deprecated versions should not be used where newer versions are available. If your legacy services do not require TLS 1.0 or 1.1 you should disable them.

Is Google SMTP relay free?

The SMTP server for Gmail is a free SMTP server that anyone across the globe can use. It allows you to manage email transactions from your Gmail account via email clients or web applications.

Is not authorized to relay messages through the Office 365 email servers?

It's likely that the email server isn't correctly set up to receive and relay messages from your organization. To fix this issue, forward this non-delivery report (NDR) to your email admin.

How to configure IIS for relay with Office 365?

How do I enable TLS 1.2 SMTP relay?

Is Google SMTP relay free?

The SMTP server for Gmail is a free SMTP server that anyone across the globe can use. It allows you to manage email transactions from your Gmail account via email clients or web applications.

Does SMTP relay require authentication?

With the new protocols in place, an authentication mechanism (like a password) is necessary to log in to an email service provider's SMTP server. This means that only verified users can send messages via that server – providing a basic level of security against the sending of unsolicited spam and phishing emails.

What is 550 relay not permitted in o365?

When a user receives a 550 relay not permitted error, it means they are not permitted to send an email via the server that they are attempting to send an email from. When users send an email from their Internet Service Providers (ISP) mail servers, they generally do not have to authenticate themselves.

What is 451 relay not permitted Office 365?

SMTP error 451 indicates when the user exceeds the limits set on the email server for sending emails. The email server will not allow the user to send more emails than the limits set on the email server; these limits are set as daily or hourly limits to restrict abusive behavior.

How to configure SMTP relay in IIS?

Click the Relay button on the Access tab, and set up the relay options for the server. Ensure that localhost and the IP address 127.0. 0.1 are granted permission to relay mail. Click OK to accept the options, and then click Apply and OK to return to the main page of the IIS Manager.

How to use port 587 for SMTP?

Port 587: The standard secure SMTP port

Modern email servers use port 587 for the secure submission of email for delivery. For example, if you use an email client software like Outlook or Apple Mail, it most likely is configured to use this port to send your messages.

How do I send an email using SMTP relay?

If you're using TLS encryption, configure your on-premise mail server to point to smtp-relay.gmail.com on port 587. If you're not using TLS encryption, configure your on-premise server to point to smtp-relay.gmail.com on port 25, 465, or 587.