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<Beispiel>@yahoo.co.uk>: host mx-eu.mail.am0.yahoodns.net[188.125.72.73]

    said: 421 4.7.0 [TSS04] Messages from 194.25.134.19 temporarily deferred

    due to user complaints - 4.16.55.1; see

    https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM

    command)

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