Hallo Telekom Team,

ich verwalte meine Emails über das Email Center über PC. Ich habe beim Versand einer Email folgende Email heute um 9:08 Uhr bekommen:

Undelivered Mail Returned to Sender (Betreffzeile)

This is the mail system at host mailout04.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.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<______de>: host mail._____.de[62.225.149.xxx] said:
    550-Sophos Anti Spam Engine has blocked this Email because the sender IP
    550 Address is blacklisted. (in reply to RCPT TO command)

In der "Undelivered Mail Returned to Sender" war in der anhängenden Message u.a. folgendes gestanden:
Diagnostic-Code: smtp; 550-Sophos Anti Spam Engine has blocked this Email because the sender IP 550 Address is blacklisted.

Kann das bitte geprüft werden? Vielen Dank