This topic explains why some emails sent through web.de may be regarded as spam.
When FREEDOME VPN is turned on and emails are sent through the web.de’s email service, the messages may be considered spam by the recipients. Without FREEDOME VPN, the same emails are not, however, treated as spam.
The reason for this is that web.de checks which IP address the message is coming from and behaves differently depending on the address type. It appears that if the IP address is a data center address instead of a residential or corporate address, web.de routes the outgoing emails through a different email forwarding server. This particular web.de email forwarding server is listed on many spam block lists. This may cause the destination email server to treat any email coming through that server as spam.
There is nothing that can be done to this on the FREEDOME VPN side. The FREEDOME VPN servers, similar to the servers of other VPN service providers, are hosted at data centers and thus the traffic comes from data center IP addresses. The only workaround to this is to turn off FREEDOME VPN when sending email through the web.de email service.