Ich erhalte die folgende Mail:
421 Too many messages (126.96.36.199) on 2018/12/10 18:58:41 GMT from
un-validated IP address: 188.8.131.52. Please add a SPF record for the
domain t-online.de to your DNS or ask your Broadband Provider / Domain
Registrar to do this, we will be unable to deliver email until this is done
due to the volume of email being sent from this IP address. Guide for bulk
senders www.bt.com/bulksender (in reply to MAIL FROM command)
This is the mail system at host mailout06.t-online.de.
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
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