Jean-Paul,
Which email service provider do you use, if that's not asking too much (you can write us the answer by email if you want).
The most probable cause for this problem is that your email provider is blocking the second email because it has activation codes, which can be interpreted as 'strange things' by an obsessively configured email service. In such case, we can associate your license with a different email address on our server. Free Gmail and Yahoo email accounts work without problems.