ProofPoint keeps blocking outgoing emails from Thunderbird, how can I resolve this?
I keep getting emails like the one below. How can I stop Proofpoint from blocking emails like this? I can't get any response from Proofpoint.
Thank you.
Forwarded Message --------
Subject: Mail delivery failed: returning message to sender Date: Mon, 23 Mar 2026 15:32:49 -0400 From: Mail Delivery System <Mailer-Daemon@server240.web-hosting.com> To: [edited]@unexpectedwildliferefuge.org
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
[edited]@marshallsterling.com host mxb-00261401.gslb.pphosted.com [148.163.148.189] SMTP error from remote mail server after initial connection: 554 Blocked - see https://ipcheck.proofpoint.com/?ip=66.29.141.68
Được chỉnh sửa bởi christ1 vào
Tất cả các câu trả lời (3)
Proofpoint is saying your IP is blocked. I encourage following their links to identify how to unblock this. or work with your email provider. Thunderbird sends mail from your IP address, but Thunderbird cannot change it.
How do I follow Proofpoints links to identify how to unblock the email? Thunderbird is my email provider. Thank you.
NO. Thunderbird is only your email client, your assistant. Your email provider is the one who authorizes the account, the password, the storage for messages. This is often the name to the right of the @ sign in an email address, but not always. It is NEVER thunderbirdd.
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