Google Activation Guide Postini Email Security - Manual (Page 21)

Change Your MX Records 25
7. Click Submit.
When you are finished switching your MX records to the message security
service, go to “Test Your MX Records” on page 41.
Tips for Changing Your MX Records with Yahoo
• If your domain registrar allows this, we recommend that you keep your current
MX records (examples shown in bold below) as a precaution for 48 to 72
hours, or until you have verified mail flow through the message security
service. However, be sure to assign the MX records shown in your activation
email with the higher priority values (lower numbers).
For example, the values of 1, 2, 3, and 4 represent higher priorities than the
values of 10 and 20.
yourdomain.com. IN MX 1 s7a1.psmtp.com
yourdomain.com. IN MX 2 s7a2.psmtp.com
yourdomain.com. IN MX 3 s7b1.psmtp.com
yourdomain.com. IN MX 4 s7b2.psmtp.com
yourdomain.com. IN MX 10 yourmailhost1.yourdomain.com
yourdomain.com. IN MX 20 yourmailhost2.yourdomain.com
• Once you are sure that mail flow through the message security service has
been established, we highly recommend that you remove your old MX records
to ensure your email traffic does not bypass the message security service and
connect directly to your mail server. (You verify your MX records later in the
activation process. See “Test Your MX Records” on page 41 and “Test Filtered
Mail Flow” on page 45.)
Make sure each MX record is entered exactly as it appears below, including the
trailing dot at the end of each record. Be sure to enter your actual domain name
for yourdomain.com. In this example, N equals your system number for the
message security service. (See your activation email to make sure you are
entering your correct system number.)
For example, if your domain is stellarshores.com, and you are on System 7 for the
message security service, you would receive the following MX records in your
activation email:
stellarshores.com. IN MX 1 s7a1.psmtp.com.
stellarshores.com. IN MX 2 s7a2.psmtp.com.
stellarshores.com. IN MX 3 s7b1.psmtp.com.
stellarshores.com. IN MX 4 s7b2.psmtp.com.
Mailserver Hostname Priority
yourdomain.com.sNa1.psmtp.com. 1
yourdomain.com.sNa2.psmtp.com. 2
yourdomain.com.sNb1.psmtp.com. 3
yourdomain.com.sNb2.psmtp.com. 4