The Sender Verification option is a method for guarding against undesired ad e-mails (spam). There are a few known cases, however, in which sending e-mails to addresses protected with sender verification fails. If this is the case with your address, follow these steps:
Go to https://admin.hostpoint.ch and log into the Control Panel with your username and password.
Select E-Mails from the menu.
Select the e-mail account you wish to modify.
Click the Spamscanner tab.
Under Main, you will see the Sender Verification checkbox, which you can uncheck.