Problems with emails


I have set AX 2009 to send emails every time an alert is triggered.

To test this I have set an alert for when a user name is changes, then I go on and change a user name and an alert is triggered ok. 1 or 2 times out of 5 I get an email, the rest of times I do not.

Looking in the email status window I see that there are a bunch of emails in status failed.

Why is it that some of the mails come through ok, while most don’t? Would be easier if it failed to 100 %

Is this a common problem?