Currently, there are so many spam emails sent to our email server, and our mail server has been overloaded.
As a temporary measure to block these spam emails, JENS SpinNet has decided to use POP before SMTP for some of IP addresses.
If you have difficulties in sending emails via our mail server, please first receive incoming email with your mail software to identify yourself as a rightful user.
You can find more details about how to send emails using POP before SMTP at the following URL.