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For customers with an 1&1 IONOS email address
This article describes the case where the receiving mail server refuses to accept an email on the grounds that the sending mail server was also used for sending SPAM mails and is therefore currently blocked. If the sending mail server is suspected of sending unauthorized mass mails, the content of the bounce mail looks like this:
5.7.1 Service unavailable; Client host[126.96.36.199] blocked using spam.blocklist-
no1.com; Please see http://www.spam.blocklist-no1.com/ip/188.8.131.52
So that we can check the case and obtain the fastest possible release of the mail server, please report the case to us using the contact form provided for this purpose. Our specialist department will then review the case and take the necessary steps to unblock it.