Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More
Archived

Blacklist spam filter

christ1 replied
gilldoc

Please, how do I get rid of this message, which is preventing me from sending any emails: "Sending of the message failed. An error occurred while sending mail. The mail server responded. Blacklisted by spam filter. Please contact customer service. Please check the message and try again." With pretty desperate regards, Gillian

Please, how do I get rid of this message, which is preventing me from sending any emails: "Sending of the message failed. An error occurred while sending mail. The mail server responded. Blacklisted by spam filter. Please contact customer service. Please check the message and try again." With pretty desperate regards, Gillian

All Replies (1)

The mail server responded. Blacklisted by spam filter.

As stated, the message is from your email provider's server. Thunderbird has got nothing to do with this.

Please contact customer service.

This is exactly what you'll have to do - talk to your email provider.