Mail delivery failed: returning message to sender

  • Resolved steffidth

    (@steffidth)


    6 years, 3 months ago

    I use the free version and till now everything worked fine. I was sending out today a newsletter and got all emails back with “Mail delivery failed: returning message to sender” It says ” host outbound.mailspamprotection.com … SMTP error from remote mail server after end of data:
    550 Message contained unsafe content (Heuristics.Phishing.Email.SpoofedDomain)”
    What can I do, whats going on.

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