User email cannot start with a number?

[bsnipes]

I have one user setup with an email address that starts with a number and my SMTP server is set to the "3CX SMTP Server". No email for new voicemails or the welcome message ever arrives when sent from the 3CX system. Other systems can send email to the email address and it is received. If I change the user email to one that starts with a letter instead of number, the emails are recieved to the new address. Can anyone confirm that this is a bug?