What is MX Records?
From Wikipedia, a mail exchanger record (MX record) is a "type of resource record in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient's domain, and a preference value used to prioritize mail delivery if multiple mail servers are available".
Why do you need to configure your MX Records for Google Apps?
How to configure your MX Records for Google Apps?
To do this, you'll need to log into your DNS settings of your domain name registrar. This is normally who you brought your domain name originally from.
Here's the MX records from Google.
Enter the following MX records.
You may not be able to enter the priority value exactly as it appears in the table below -- if you can, make sure each record follows the indicated order. If you aren't able to assign priorities, you should only enter aspmx.l.google.com.. Set any TTL values to 1 Hour (value=3600).
Google Apps MX record values
Here are the values to use in your domain's DNS settings to configure MX records for Google Apps. Each record points to a Google mail server. Note important details below about setting mail server Priorities.
You enter these values at your domain host, not in your Google Admin console.
Note: Some domain hosts use different labels for the name and value fields, and some hosts also require a trailing period at the end of the server name.
For example: ASPMX.L.GOOGLE.COM.
Make sure you follow the specific instructions for your domain host when entering these record values.
|Name/ Host/ Alias||Time to Live (TTL*)||Record Type||Priority||Value/ Answer/ Destination|
|Blank or @||3600||MX||1||ASPMX.L.GOOGLE.COM|
|Blank or @||3600||MX||5||ALT1.ASPMX.L.GOOGLE.COM|
|Blank or @||3600||MX||5||ALT2.ASPMX.L.GOOGLE.COM|
|Blank or @||3600||MX||10||ALT3.ASPMX.L.GOOGLE.COM|
|Blank or @||3600||MX||10||ALT4.ASPMX.L.GOOGLE.COM|
* The TTL is the number of seconds before subsequent changes to the MX record go into effect. Once the MX records are configured correctly, we recommend changing the TTL value from 3600 to 86400, which tells servers across the Internet to check every 24 hours for updates to the MX record instead of every hour.