T-online accounts cannot be reached in Germany

T-online accounts cannot be reached in Germany

Dear Zoho-Team,

since a while it is no more possible to send Emails out of Zoho to any account with a an email from T-online.de in Germany. Message received all the time:

This message was created automatically by mail delivery software. 

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. 

xxx@t-online.de, ERROR_CODE :554, ERROR_CODE :IP=135.84.80.237 - A problem occurred. (Ask your postmaster for help or to contact tosa@rx.t-online.de to clarify.) (BL)

Do you have a solution for this ?
Many thanks
Cheers
Ralph
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