Configure your Domain for Microsoft Office 365-
•You can verify your domain with Microsoft Office 365 which helps you to use your domain as prefix to your Usernames in your Office 365 IDs.
Configure Office 365 as your mail server for your Domain-
1.Log in to your Microsoft Office 365 Online portal account.
2.Click Settings followed by Domains.
3.Click Add Domain.
3.Enter the domain you are setting up and click Next.
5.Copy the TXT value.
6.Log in to your Host control page (ex- Godady).
(Steps 7 & 8 may vary on the basis of hosting site)
7.Click Domain Center from the Domains panel.
8.Click the arrow next to your domain followed by Edit DNS Settings.
9.Scroll down to the TXT and SRV Records section and click Add Record.
10.Paste the TXT value into the Value field and click Add.
11.Click Save followed by Yes to confirm the changes.
12.Return to the Office 365 Administration screen and click Verify.
13.Choose I'll manage my own DNS records and click Next.
14.Copy the Expected record in the MX records section.
15.Repeat Step 8 to Edit DNS Settings of your domain.
16.In the MX Records section, choose Other mail server, paste the MX record into the MX 1field, type 0 in the Priority field, and click Save followed by Yes to confirm the changes.
17.Add the following CNAME records to the corresponding subdomains:
18.Again goto Edit DNS Settings.
19.Scroll down to the TXT and SRV Records section and click Add Record.
20.Copy v=spf1 include:spf.protection.outlook.com -all and paste it into the Value field. Then, click Add.
21.Click Add Record.
22.Change the record type to SRV, add the following information, and click Add.
23.Click Add Record, change the record type to SRV, and add the following information before clicking Add.
24.Click Save followed by Yes to confirm the changes.
25.Return to the Microsoft Office 365 DNS verification page and click Verify.
26.Your domain is now ready to use. Click Finish.
One can visit mxtoolbox.com to verify all the updated records
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