To use Office 365 to receive or send these emails, you need to synchronize it with Microsoft Outlook. To do this, you need to use the appropriate SMTP, POP, or IMAP settings for Office 365 to facilitate this.
SMTP, IMAP AND POP Explained
SMTP (Simple Mail Transmission Protocol) is an email application layer protocol. To send email via SMTP, a client initiates a TCP connection to an SMTP server, which always listens to the appropriate port, which is TCP 25 by default. However, this may also be port 587 and 465. It is important to note that in order to send emails from Office 365, SMTP settings must first be configured in the email client.
Office 365 SMTP FAQs
Is SMTP Relay Supported in Office 365?
How can I configure Office 365 as an SMTP?
What is POP?
Simply put, POP3 (Post Office Protocol 3) is an email receiving protocol. POP3 was basically designed to erase email messages from a mail server after they had been downloaded by an email client. It is important to note that this functionality also applies to Exchange Online servers. Therefore Office 365 Outlook’s web interface cannot display POP3-downloaded emails.
The following procedure is used to retrieve email with a POP client:
- First, it connects to the email server through ports 110 and 995 for SSL/TLS communications.
- It retrieves your email messages.
- Then it erases all backups of emails from the server.
- Finally, it breaks off connection with the server
The server can be set up to maintain a duplicate of the messages downloaded by POP clients notwithstanding POP3’s routine erasure of received emails.
Ideally using POP3 to receive email on email clients may not be practical if you need to access your mail from a variety of devices.
Besides POP3, IMAP (Internet Message Access Protocol) is also an alternative protocol for receiving emails. In contrast to POP3, when using IMAP, email messages are saved on a mail server and are not erased when a user receives email.
The following describes the operation of an IMAP email server:
- First, it establishes a connection to the mail server on port 143; SSL/TLS connections use port 993.
- Then it searches and retrieves emails
- Finally it disconnects after closing the email client app.
With a local email client, a user organizes and synchronizes received email messages into folders. IMAP may be preferable, if you need to use email clients on both your home and business computers or if you use both a web interface and an email client.
Advantages of IMAP over POP
There is just one way communication: Emails are retrieved from the server without any further synchronization between the server and the client. There is no way to track which emails have been read and which have not.
There is 2-way communication: Emails are synchronized in both directions, from the server to the various clients, all the time. In IMAP emails retain their read/unread state even after being deleted. Additionally, all devices immediately reflect whatever changes you make to the emails.
Only be accessed from a single device.
Access your emails from multiple devices.
Unless the option to “Keep a copy on the server” is provided, downloaded emails are permanently erased from the server.
Stored indefinitely on the server and can be retrieved at any time.
Emails are downloaded to the smartphone, using up space on the device’s local storage.
IMAP has better storage utilization. It stores emails on a remote server, it frees up space on your local device.
Unless you manually backup your emails, emails are not backed up.
Emails are backed up automatically for future retrieval.
Try our Active Directory & Office 365 Reporting & Auditing Tools
Try us out for Free. 100’s of report templates available. Easily customise your own reports on AD, Azure AD & Office 355.
How to locate your Microsoft 365 Server settings
- Log in to Outlook online by entering your Microsoft 365 email address and password.
- To see all of Outlook’s configuration options, click the gear icon in the top right corner.
- To sync your inbox, click on Mail and then Sync Mail. Microsoft 365’s POP, IMAP, and SMTP server information is displayed here.
- Then click on settings, and then mail flow.
- Finally use your incoming mail port (IMAP or POP) and outgoing mail port (SMTP) to configure your email client oiMGEr device.
Office365 SMTP Configuration Cettings
Server for SMTP: smtp.office365.com
Is TLS necessary? Yes, it is if it’s available.
Is SSL necessary? Yes
Authentication: Yes (select Login if multiple options are available)
Username: Your username should be your Microsoft 365 email address in its entirety.
Office 365 IMAP Settings
All in all, IMAP’s ability to allow two-way syncing makes it the preferred choice when you need to receive emails from multiple devices. To configure your Office 365 IMAP settings, you need to key in the following configuration settings:
IMAP Server: outlook.office365.com
Method of encryption: TLS
Username: Full Microsoft 365 email address.
Password: Should be the password associated with your Microsoft 365 email address.
Office365 POP3 Settings
It’s not often advisable to use POP3 for receiving emails due to its limitations, as mentioned above. However, POP3 is good, if you only have a single device. Please configure the following Office365 settings to use it:
Method of Encryption: TLS
Username: Full Microsoft 365 email address.
Password Input: Associated with your Microsoft 365 email address.
Common Configuration Errors
A recommended solution to this is that instead of logging in using a username and password, you should utilize OAuth authentication. Before doing this, verify that your username and OAuth provider are correct if you have already set up OAuth.
Password error: Logon failure: unknown user name or bad password
Either your Office 365 login credentials are incorrect or Office 365 does not recognize your username.
Recheck your username and password, and please note that the passwords are case-sensitive.
Please note that sometimes, in addition to a username and password, you may need to use OAuth to access your account.
Connection timed out or Could not connect to…
These errors indicate that a necessary port on your server’s firewall is being blocked.
Make sure that TCP ports (587, 995, and/or 993) are open by getting in touch with your hosting business and requesting that they unblock these ports.
Office365 SMTP Error: 554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied
Verify that the “From” email is set to the SMTP email address (Hesk settings > General tab) and that an email address is NOT entered in the “From” name field.
Office 365 SMTP, IMAP & POP Server Settings (Explained) Conclusion
Try InfraSOS for FREE
Invite your team and explore InfraSOS features for free