So here's a new twist. I saw gene's mention that it worked for him today from his ISP in comment 71. I once again tried to see what would happen using 82.0a from 5-16-2020 but it failed. Then it auto updated itself to 90.0a from 29-5-2021 and failed again. Then I wondered: What happens if I try to send from Thunderbird@familie-leininger.at to my gmail.com address. I got a bit of a different server response in 90.0a. It's saying I was spamming but that the recipient was "(null)". Obviously not but...huh? Below is what 90.a spit out in error console. Prompter: internal dialogs not available in this context. Falling back to window prompt. Prompter.jsm:1084 mailnews.smtp: Socket timed out. SmtpClient.jsm:512:17 mailnews.smtp: Command failed: 451 Sorry, you are spamming!; currentAction=_actionRCPT SmtpClient.jsm:502:19 mailnews.smtp: RCPT TO failed for: <removed_to_prevent_spam>@gmail.com SmtpClient.jsm:1191:19 mailnews.smtp: Can't send mail - all recipients were rejected SmtpClient.jsm:1204:21 mailnews.send: Sending failed; An error occurred while sending mail. The mail server responded: Sorry, you are spamming!. Please check the message recipient "(null)" and try again., exitCode=2153066783, originalMsgURI= MessageSend.jsm:321:27 Prompter: internal dialogs not available in this context. Falling back to window prompt. Prompter.jsm:1084 So at this point, I went back and set up 82.0a 5-16-2020 again, made sure it couldn't auto-update to 90.0a and, again, tried to send to my gmail.com account. Error Console spit out nothing at all but I got the error message "An error occurred while sending mail. The mail server responded: Sorry, you are spamming!. Please check the message recipient "<removed_to_prevent_spam>@gmail.com" and try again." So, unlike what 90.0a did, it wasn't a "(null)" recipient like 90.0a. I'm not trying to go off reservation with this new info but its' weird for sure and just wanted to share this result.
Bug 1710224 Comment 76 Edit History
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So here's a new twist. I saw gene's mention that it worked for him today from his ISP in comment 71. I once again tried to see what would happen using 82.0a from 5-16-2020 but it failed. Then it auto updated itself to 90.0a from 29-5-2021 and failed again. Then I wondered: What happens if I try to send from Thunderbird@familie-leininger.at to my gmail.com address. I got a bit of a different server response in 90.0a. It's saying I was spamming but that the recipient was "(null)". Obviously not but...huh? Below is what 90.a spit out in error console. Prompter: internal dialogs not available in this context. Falling back to window prompt. Prompter.jsm:1084 mailnews.smtp: Socket timed out. SmtpClient.jsm:512:17 mailnews.smtp: Command failed: 451 Sorry, you are spamming!; currentAction=_actionRCPT SmtpClient.jsm:502:19 mailnews.smtp: RCPT TO failed for: <removed_to_prevent_spam>@gmail.com SmtpClient.jsm:1191:19 mailnews.smtp: Can't send mail - all recipients were rejected SmtpClient.jsm:1204:21 mailnews.send: Sending failed; An error occurred while sending mail. The mail server responded: Sorry, you are spamming!. Please check the message recipient "(null)" and try again., exitCode=2153066783, originalMsgURI= MessageSend.jsm:321:27 Prompter: internal dialogs not available in this context. Falling back to window prompt. Prompter.jsm:1084 So at this point, I went back and set up 82.0a 5-16-2020 again, made sure it couldn't auto-update to 90.0a and, again, tried to send to my gmail.com account. Error Console spit out nothing at all but I got the error message "An error occurred while sending mail. The mail server responded: Sorry, you are spamming!. Please check the message recipient "<removed_to_prevent_spam>@gmail.com" and try again." So, unlike what 90.0a did, it wasn't a "(null)" recipient like 90.0a. I'm not trying to go off the reservation with this new info but its' weird for sure and just wanted to share this result.
So here's a new twist. I saw gene's mention that it worked for him today from his ISP in comment 71. I once again tried to see what would happen using 82.0a from 5-16-2020 but it failed. Then it auto updated itself to 90.0a from 29-5-2021 and failed again. Then I wondered: What happens if I try to send from Thunderbird@familie-leininger.at to my gmail.com address. I got a bit of a different server response in 90.0a. It's saying I was spamming but that the recipient was "(null)". Obviously not but...huh? Below is what 90.a spit out in error console. Prompter: internal dialogs not available in this context. Falling back to window prompt. Prompter.jsm:1084 mailnews.smtp: Socket timed out. SmtpClient.jsm:512:17 mailnews.smtp: Command failed: 451 Sorry, you are spamming!; currentAction=_actionRCPT SmtpClient.jsm:502:19 mailnews.smtp: RCPT TO failed for: <removed_to_prevent_spam>@gmail.com SmtpClient.jsm:1191:19 mailnews.smtp: Can't send mail - all recipients were rejected SmtpClient.jsm:1204:21 mailnews.send: Sending failed; An error occurred while sending mail. The mail server responded: Sorry, you are spamming!. Please check the message recipient "(null)" and try again., exitCode=2153066783, originalMsgURI= MessageSend.jsm:321:27 Prompter: internal dialogs not available in this context. Falling back to window prompt. Prompter.jsm:1084 So at this point, I went back and set up 82.0a 5-16-2020 again, made sure it couldn't auto-update to 90.0a and, again, tried to send to my gmail.com account. Error Console spit out nothing at all but I got the error message "An error occurred while sending mail. The mail server responded: Sorry, you are spamming!. Please check the message recipient "<removed_to_prevent_spam>@gmail.com" and try again." So, unlike what 90.0a did, it wasn't a "(null)" recipient like 90.0a. I'm not trying to go off the reservation with this new info but it's weird for sure and just wanted to share this result.