After nearly three years of planning, data migration, and enhancements to the spam/virus protection within Google Apps, June 15, 2015 marks the day when Postini email security and compliance solutions truly ceases to exist. As of the 15th, mail flow through Postini systems will halt.
Customers that have not updated their MX records will stop receiving email; messages will bounce back to the sender
For customer migrating from Google Message Discovery (aka Postini archiving), the MX records need to change, even if the data migration or validation processes are still active.
Have questions, contact our service team for help.