Validating mx record

If you are letting Microsoft manage your DNS settings with NS records, you can't add subdomains.Typically, you can add up to 900 domains to your Office 365 subscription.Using a custom domain like "[email protected]" with Office 365 can help build credibility and recognition for your brand.

If you are letting Microsoft manage your DNS settings with NS records, you can't add subdomains.Typically, you can add up to 900 domains to your Office 365 subscription.Using a custom domain like "[email protected]" with Office 365 can help build credibility and recognition for your brand.

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Last Updated: 3/28/2018 Mail is delivered to the mail exchange server with the lowest preference number (highest priority), so the MX record you use for mail routing should have the lowest preference number, typically 0 or High priority.

It's important that you have or create only one TXT record for SPF.

If you want to have your email look like [email protected]: buy the domain or just follow the steps in Add your users and domain to Office 365 if you own it already. Make sure your organization qualifies and then sign up for the service.

Want to know more about becoming the Office 365 admin for your school?

If you manage your own DNS records and your DNS host does not support all the DNS records that Office 365 needs, some Office 365 features won’t work.

We recommend that you transfer your domain to a registrar that supports all required DNS records.

This setup relies on you keeping the MX records with your existing host, and creating individual email forwards for each user/group etc in your Office365 plan, so you might have something like this in the registrar’s mail settings: * = [email protected] exact settings will depend on what you’ve setup thus far of course.

You can also use this setup to mix-n-match using Office365 and POP3 accounts from your registrar, should you need to do so.

These include; – IP realtime blacklists – checking with a database provider such as Spamhaus whether the server that is connecting is on a list of servers that is known to be sending spam – IP-block blacklists – checking (usually with a database provider but sometimes using other methods) whether the server that is connecting is connecting from an address that is contained in within a block of addresses known to be used by internet providers as a dynamic range; that is, users of these addresses are not static and in theory should not be running email servers.

IP-Block blacklists can also be used to reject email from servers in particular countries, such as far-Eastern countries where a lot of spam comes from.