Around 30% of the emails I send get returned. If I resend, it always works.
Around 30% of the emails I send get returned. If I resend, it always works. I am using Thunderbird 102.10.1 (64-bit) on OpenSuse Leap 15.4 The returned message is eg.
This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed permanently:
* [email protected]
Reason: A message that you sent to the following recipient could not be delivered due to a permanent error. ** The remote server ?? responded with: ** [email protected] ??:?? This message was created automatically by mail delivery software on the server .
Reporting-MTA: dns; avasout-ptp-003 [84.93.230.244]
Received-From-MTA: dns; [192.168.0.30] [212.159.97.201]
Arrival-Date: Fri, 05 May 2023 11:11:17 +0100
Final-recipient: rfc822; [email protected]
Diagnostic-Code: smtp; 550-5.7.26 This mail is unauthenticated, which poses a security risk to the
Last-attempt-Date: Fri, 05 May 2023 11:11:17 +0100
I compared the source for the failed message and that for the successfully re-sent message. The significant difference seems to be that order of items in the header changed: FAILED: Subject To Ref Content-Language From
SUCCEEDED: From Subject To Ref Content-Language
Does anyone have an idea about this?
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Final-recipient: rfc822; [email protected]
Diagnostic-Code: smtp; 550-5.7.26 This mail is unauthenticated, which poses a security risk to the
Risk to the What exactly. I think you missed a bit there. However google indicates that the 550-5.7.26 may well indicate server issues with plus net. Have you contacted them?