Antwort Does Office 365 still support SMTP? Weitere Antworten – Does Office 365 support SMTP

Does Office 365 still support SMTP?
Yes, you can use Microsoft 365/Office 365 as an SMTP relay. In the next section, we show you how you can send your WordPress site's transactional emails using the Office 365 SMTP server. You can also create connectors to send emails with the Office 365 SMTP relay.If you're trying to add your Outlook.com account to Outlook or another mail app, you might need the POP, IMAP, or SMTP settings. You can find them below or by viewing them in your Outlook.com settings.Enable SMTP AUTH for specific mailboxes

  1. Open the Microsoft 365 admin center and go to Users > Active users.
  2. Select the user, and in the flyout that appears, select Mail.
  3. In the Email apps section, select Manage email apps.
  4. Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.

What is the outgoing SMTP server for Office 365 : Server Settings

Here are the Office 365 SMTP settings for your business account: Incoming server setting: outlook.office365.com. Outgoing SMTP server setting: smtp.office365.co.

What protocol does Office 365 use for email

Settings users use to set up POP3 or IMAP4 access to their Exchange Online mailboxes

Protocol Server name Encryption method
POP3 Outlook.office365.com SSL/TLS
IMAP4 Outlook.office365.com SSL/TLS
SMTP Smtp.office365.com STARTTLS

2. 11. 2023

How to send mail using Office 365 : Try it!

  1. Select Home > New Email.
  2. Add recipients, a subject, and a message in the email body.
  3. Select Send.

Microsoft statement is, that SMTP Auth via Basic auth will be retired in September 2025.

Today, we are announcing that Exchange Online will permanently remove support for Basic authentication with Client Submission (SMTP AUTH) in September 2025.

Is SMTP deprecated

SMTP AUTH Client Connections Deprecated in 2025 Together with Introduction of a New External Recipient Rate Limit. The Exchange development team has clearly been busy lately. On April 15, 2024, they announced two major changes: The deprecation of basic authentication for client submission (SMTP AUTH) in September 2025.It is part of the standards defined in the Simple Mail Transfer Protocol (SMTP) for email transmission. Port 587 usually requires authentication and encryption, providing a secure connection for sending emails. It is commonly used for the submission of outgoing mail.Test the Office365 SMTP Relay Service from PowerShell

  1. To open PowerShell right-click the start button and Choose Windows PowerShell.
  2. Enter the following command. $msolcred = get-credential.
  3. A window pops up.
  4. Then use the Send-MailMessage command to send a test email.
  5. If there is no error, check your inbox for a new email!


IMAP is disabled by default in Office 365. If you want to access your Office 365 email account using IMAP you have to manually enable it. Here is a step-by-step guide on how to do so: Go to your Exchange admin center.

Should I use port 25 or 587 for SMTP Office 365 : Originally, the Simple Mail Transfer Protocol (SMTP) used port 25. Today, SMTP should instead use port 587 — this is the port for encrypted email transmissions using SMTP Secure (SMTPS). Port 465 is also used sometimes for SMTPS. However, this is an outdated implementation and port 587 should be used if possible.

Why can’t I send emails from Office 365 : Incorrect Email Account settings

When the Email Account settings are incorrect or there were recent changes made to your email account, such as changes in credentials, it can prevent Outlook 365 from sending emails. This also includes incorrect incoming and outgoing server ports and settings.

Is SMTP still in use

Post Office Protocol – Is SMTP still being used A large number of servers are still using SMTPS, and port 465 is still active. With its support for Transport Layer Security (TLS) encryption, Port 587 has become the de facto standard for email submission. Most mail servers are compatible with port 587.

SMTP AUTH Client Connections Deprecated in 2025 Together with Introduction of a New External Recipient Rate Limit. The Exchange development team has clearly been busy lately. On April 15, 2024, they announced two major changes: The deprecation of basic authentication for client submission (SMTP AUTH) in September 2025.

  • Constant Contact.
  • SendGrid.
  • Mailgun.
  • Fresha.
  • CodeTwo Email Signatures 365.

Should I use port 465 or 587 : Originally, the Simple Mail Transfer Protocol (SMTP) used port 25. Today, SMTP should instead use port 587 — this is the port for encrypted email transmissions using SMTP Secure (SMTPS). Port 465 is also used sometimes for SMTPS. However, this is an outdated implementation and port 587 should be used if possible.