Office 365 smtp relay not working

1. Why is my SMTP relay not sending mail?
2. How do I enable TLS 1.2 SMTP relay?
3. How do I know if my SMTP is open relay?
4. What is the difference between SMTP and SMTP relay?
5. How to use port 587 for SMTP?
6. How do I change my SMTP settings in Office 365?
7. How do I find my SMTP settings in Office 365?
8. What tool to test SMTP relay?
9. What is the difference between SMTP and SMTP relay?
10. How can I tell if my firewall is blocking SMTP?
11. What is the SMTP gateway for Office 365?

Why is my SMTP relay not sending mail?

Verify that your firewall or antivirus software is not blocking the outgoing mail server/SMTP relay. Try turning off your firewall or antivirus software and sending a message. If the message goes through, you need to adjust your firewall or antivirus software's settings.

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.

How do I know if my SMTP is open relay?

So, how can I do the open relay test? You can telnet to the server and send an email to another domain using the MAIL FROM and RCPT TO commands. If the final response code is 250 and no authentication was requested, your server is an open relay.

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.

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 change my SMTP settings in Office 365?

Once you log in to the Microsoft Outlook mail app, use the toolbar and navigate to File > Account Settings > Server Settings. Then, click on Outgoing Mail to set up your SMTP Outgoing Server settings.

How do I find my SMTP settings in Office 365?

Find your Exchange mailbox server settings

In Outlook Web App, on the toolbar, select Settings. > Mail > POP and IMAP. The POP3, IMAP4, and SMTP server name and other settings you may need to enter are listed on the POP and IMAP settings page.

What tool to test SMTP relay?

MxToolbox is another great tool to run your SMTP diagnostics. Based on the description found on their website, this tool can perform an Open Relay Test and check the reverse DNS (PRT) record. MxToolbox offers additional features that can prove handy to you, such as MX Lookup, to figure out your email server's address.

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.

How can I tell if my firewall is blocking SMTP?

Type telnet MAILSERVER 25 (replace MAILSERVER with your mail server (SMTP) which may be something like server.domain.com or mail.yourdomain.com). Press Enter. If that port is blocked, you will receive a connection error.

What is the SMTP gateway for Office 365?

SMTP gateway: Office 365

But by using SMTP client submission, you can send scanned documents directly to anyone. SMTP gateways can also be configured to have your apps send out reminders to yourself and your customers. The applications for SMTP gateways are limitless, as long as you authenticate your devices properly.