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We have multiple domains in our Google apps (example1.com, example2.com). Emails and aliases for example1.com are working ok - mail sent to user@example1.com is redirected to useralias@example1.com.

I'm trying to set an alias user@example2.com and info@example2.com to be redirected to user@example1.com - this is an option in user settings. But the problem is that when I try to send an email it bounces back.

Mail delivery failed: returning message to sender
A message that you sent could not be delivered to one or more of 
its recipients. This is a permanent error. The following address(es) failed...

I checked it here: http://mxtoolbox.com/ and I get this error:

550-5.1.1 The email account that you tried to reach does not exist. Please try
550-5.1.1 double-checking the recipient's email address for typos or
550-5.1.1 unnecessary spaces. Learn more at
550 5.1.1 http://support.google.com/mail/bin/answer.py?answer=6596 

Any ideas why it's not working?

EDIT: If I send an email from a domain on our server (for example: whateveruser@example1.com or whateveruser@example3.com) to any alias at example2.com, it also won't be received. But from other emails on other servers it works fine.

share|improve this question
Did you set up MX records for example2.com? – Vidar S. Ramdal Oct 23 '13 at 8:49
Yes, MX records are set up, just like for example2.com – belovah Oct 23 '13 at 9:11

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