Hi, knauf.com is accepting much of our delivered mails, however afterwards probably drop them as recipients reported via phone, that none of the mails arrive in their mailboxes.
Mail to postmaster@ and a known contact at knauf.com did not yield any response so far. Apr 23 10:12:54 mx3 postfix/smtp[654640]: 724585DCFA: to=< postmas...@knauf.com>, relay=mailstream-eu1.mxrecord.io[172.65.245.214]:25, delay=51, delays=0.36/50/0.18/0.03, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 4VNvxf1pTvz2CcMQ) Sender-Domain IP is in UCEPROTECTL3, however none of his sending systems. Bad thing is, that this is one of the cluster-ips from IONOS/1&1, so many of our senders, having their domains hosted at IONOS/1&1 are currently affected even though non of the mail-sending systems appears in any blacklist. Any help is greatly appreciated. Thank you. Stefan
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