RUTX50 Error while sending emails

NETWORKING SOLUTIONS
1

Hello,

I am trying to configure SMS forwarding to my email on a RUTX50 router with RUTX_R_00.07.14.2 firmware.

I have correctly configured the email recipient. I get an error when I test sending messages.

After analyzing the logs, I tried to find the cause of the error and manually sent emails via the SMTP server based on the log messages.

I have discovered that the SMTP server probably rejects messages due to the lack of spaces after the “from:” and “to:” fields. After adding these spaces, the message was sent correctly.

Below I am attaching the logs from the device and the communication with the server.

Best regards

39165 Thu May 29 09:55:15 2025 daemon.err uhttpd[7948]: sendmail: send:'NOOP'
39166 Thu May 29 09:55:15 2025 daemon.err uhttpd[7948]: depth=2 C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root G2
39167 Thu May 29 09:55:15 2025 daemon.err uhttpd[7948]: verify return:1
39168 Thu May 29 09:55:15 2025 daemon.err uhttpd[7948]: depth=1 C = US, O = DigiCert Inc, OU = www.digicert.com, CN = RapidSSL TLS RSA CA G1
39169 Thu May 29 09:55:15 2025 daemon.err uhttpd[7948]: verify return:1
39170 Thu May 29 09:55:15 2025 daemon.err uhttpd[7948]: depth=0 CN = *.xxxxx.pl
39171 Thu May 29 09:55:15 2025 daemon.err uhttpd[7948]: verify return:1
39172 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: 250 8BITMIME
39173 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250 ok'
39174 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'EHLO RUTX50'
39175 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250-smtp.xxxxx.pl'
39176 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250-PIPELINING'
39177 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250-AUTH=LOGIN PLAIN'
39178 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250-AUTH LOGIN PLAIN'
39179 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250-SIZE'
39180 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250-X-RCPTLIMIT 100'
39181 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250 8BITMIME'
39182 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'AUTH LOGIN'
39183 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'334 VXNlcm5hbWU6'
39184 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:''
39185 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'334 UGFzc3dvcmQ6'
39186 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:''
39187 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'235 go ahead'
39188 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'MAIL FROM:<aaaaa@xxxxx.pl>'
39189 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250 ok'
39190 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'RCPT TO:<aaaaa@xxxxx.pl>'
39191 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'250 ok'
39192 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'DATA'
39193 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'354 go ahead'
39194 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'Content-Type: text/plain; charset="utf-8"'
39195 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'Content-Transfer-Encoding: 8bit'
39196 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'subject:Test email'
39197 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'from:aaaaa@xxxxx.pl'
39198 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'to:aaaaa@xxxxx.pl'
39199 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:''
39200 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'Test email from: RUTX50'
39201 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: send:'.'
39202 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: recv:'554 W polu From:/Sender: uzyles adresu, ktory nie jest przypisany do Twojego konta / From:/Sender: header contents do not match any of your addresses (#5.3.0)'
39203 Thu May 29 09:55:16 2025 daemon.err uhttpd[7948]: sendmail: . failed

2025-05-29_11h08_26
2025-05-29_11h08_26965×484 22.9 KB

3

Greetings,

I have done the same configuration, just on the latest firmware, 7.14.3 (which shouldn’t make a huge difference), and I was unable to reproduce the issue. The email was forwarded successfully, and no errors are visible in the device’s logs.

My first suggestion would be to extract the troubleshooting file:

  1. Log in to WebUI
  2. Press on System → Maintenance → Troubleshoot
  3. Scroll down to Troubleshoot section and press “Download”

After you do so, please fill out the form that I’ve sent you. In the form, you’ll see where it says Ticket ID, simply enter 14002 and I’ll reach out to you.

When you extract the troubleshoot file, you can try and upgrade your firmware to the latest just in case to see if the issue is still present, you can let me know if it is once I reach out to you via e-mail.

Kindly waiting for your reply,
M.

4

Hello,

Unfortunately I did not receive the message with the form. I do not see it in spam either.

Best regards

Edit:
The problem still persists in the latest firmware version.

5

Hello,

I’ve tried sending the form again, could you confirm if you see it?

Regards,
M.

6

Hello,

Yes, I have already submitted the form.

Best regards