How do I whitelist an IP address in Exchange Online?

How do I whitelist an IP address in Exchange Online?

IP Whitelisting

  1. Sign into Office 365 and click “Admin” > “Admin Centers” > “Exchange”
  2. Under the “Protection” list, choose “Connection Filter”
  3. Click the “Pencil Icon” to edit.
  4. Choose “Connection Filtering” on the left side menu.

How do I block an exchange IP address online?

Blocking IP addresses with a connection filter

  1. In the Exchange admin center (EAC), navigate to Protection > Connection filter, and then double-click the default policy.
  2. Click the Connection filtering menu item.
  3. Click Add image 365 add icon .

What is the IP allow or block list entries limit in Exchange Online Protection?

IP Allow or IP Block list limit – When configuring an IP Allow list or an IP Block list in the connection filter, you can specify a maximum of 1273 entries, where an entry is either a single IP address or a CIDR range of IP addresses from /24 to /32.

What does Exchange Online Protection do?

Exchange Online Protection (EOP) is the cloud-based filtering service that protects your organization against spam, malware, and other email threats. EOP is included in all Microsoft 365 organizations with Exchange Online mailboxes.

What ports does o365 use?

Office 365: POP, IMAP and SMTP settings for Office 365

POP settings Server name: Port: 995 Encryption method: SSL
IMAP settings Server name: Port: 993 Encryption method: SSL
SMTP settings Server name: Port: 587 Encryption method: TLS or STARTTLS

How do I block an IP address on o365?


  1. Expand the protection and click on “Connection Filter” then click on pencil sign.
  2. Now click on Connection Filtering and you will see the below screen to add the allow and block IPs . You can enable Safe Sender which will ensure safe sender domains are not mistakenly marked as spam.

How do I block a domain in exchange 365 online?

In the Exchange admin centre, go to Mail flow > Rules. Click Add, and then select Create a new rule. Specify a name for the rule this can be the one stated above for rule. Click More options then, under Apply this rule if, select the subject or body > subject or body matches the domain you want to block.

What is the purpose of IP Allow list and IP Block List?

The IP Allow List takes precedence over the IP Block List (an address on both lists is not blocked). The IP Allow List and the IP Block List each support a maximum of 1273 entries, where an entry is a single IP address, an IP address range, or a Classless InterDomain Routing (CIDR) IP.

Is Exchange Online secure?

Exchange Online provides encryption at every level and many ways to encrypt email outside of your organization. All data is encrypted at rest. “Data at rest” refers to data that isn’t actively in transit. In Exchange Online, email data at rest (sitting on a hard drive in a secure data center) is encrypted.

Is exchange email secure?

Transport Layer Security: With TLS (Transport Layer Security) in place, Microsoft ensures that the communication link between the client and Exchange Online Servers is encrypted at all times thereby preventing spoofing attempts and also providing confidentiality of emails through encryption.

Does o365 have a firewall?

Office 365 has the benefit of built-in, high-end security. But not all cloud applications have such extensive security. A cloud firewall makes this possible. A cloud firewall like Zscaler’s allows you to optimize your network and security.

What is my office365 server name?

Log in to your Microsoft 365 Admin Center.

  1. If you have the domains card on your home page, click the Domains header. If you do not have the domains card, open the menu to the left and go to Settings > Domains.
  2. Select your domain.
  3. You can find your host name next to your MX value under Exchange Online.