I'm not much of a football fan but this year I happen to be within earshot of the Super Bowl on the TV. When the half time show came on I took a break and watched. 

As a young adult when Madonna first came onto the scene I was an early fan. 30 years later all I can say is WOW. She still has it and I can honestly say this was the first really entertaining half time show in many years.

-OUT

When a customer makes an invoice payment sent from WHMCS via PayPal the payment may not be reflected in WHMCS even though you have correctly set IPN.

The error in the WHMCS states "Invalid Receiver Mail". 

This is caused by the email address account entered into WHMCS not being the primary PayPal account.

To resolve this issue either change your primary email account in PayPal to reflect the address in your WHMCS installation or change the address in WHMCS to your primary PayPal email address.

If you use Microsoft Office 365 for your company email and WHMCS for your clients you may have seen some errors while trying to setup the SMTP server settings within WHMCS.

The specific error is:

Admin Email Notification Sending Failed - SMTP Error: Data not accepted. SMTP server error: 5.7.1 Client does not have permissions to send as this sender.

WHMCS sends the mail from the "System Emails From Email" address. If this address is not in your Office 365 account, the connection will fail.