Mails an gmail-Adressen bouncen. Meldung

host gmail-smtp-in.l.google.com[64.233.166.27]

    said: 550-5.7.26 This message does not pass authentication checks (SPF and

    DKIM both 550-5.7.26 do not pass). SPF check for [andrea-thieme.de] does

    not pass with 550-5.7.26 ip: [194.25.134.21].To best protect our users from

    spam, the message 550-5.7.26 has been blocked.

Was kann ich tun?

Danke