Events reporting via email stopped working

Good afternoon,

I have 2 RUTs running, one being a RUTX50 (regular ISP) and the other a RUTC50 (SIM), both currently running R_00.07.14.1.
Ever since firmwares after R_00.07.12.3 on the RUTX50 and one more version after that, also on the RUTC50, any events report via email stopped working.
This goes for Events Reporting, as well as for the new Event Juggler. From the Events Reporting sending the test mail does work just fine and gets received.

To check if it was something altered, or a glitch in the config, I reset the RUTX50 to factory defaults to test on R_00.07.14.1, but even with a minimal config it would not work.
For the life of me, I cannot find any specific info in the logs to point me in the right direction, accept “daemon.err event_juggler: Failed to send mail”.

Below a bit from the RUTX50 System log:

1310 Tue May 6 11:11:01 2025 kern.notice User “admin” successfully authenticated on HTTPS from 10.0.0.1 to 192.168.133.1
1311 Tue May 6 11:11:01 2025 daemon.info event_juggler: [1] Log event triggered
1312 Tue May 6 11:11:01 2025 daemon.info event_juggler: [1] Event triggered
1313 Tue May 6 11:11:01 2025 daemon.err uhttpd[8486]: vuci: accepted login for admin from 10.0.0.1
1314 Tue May 6 11:11:02 2025 daemon.info dnsmasq[7350]: 175 ::1/50909 query[A] mail.haleysystems.nl from ::1
1315 Tue May 6 11:11:02 2025 daemon.info dnsmasq[7350]: 175 ::1/50909 cached mail.haleysystems.nl is 94.209.111.43
1316 Tue May 6 11:11:02 2025 daemon.info dnsmasq[7350]: 176 127.0.0.1/50909 query[A] mail.haleysystems.nl from 127.0.0.1
1317 Tue May 6 11:11:02 2025 daemon.info dnsmasq[7350]: 176 127.0.0.1/50909 cached mail.haleysystems.nl is 94.209.111.43
1318 Tue May 6 11:11:02 2025 daemon.info dnsmasq[7350]: 177 ::1/50909 query[AAAA] mail.haleysystems.nl from ::1
1319 Tue May 6 11:11:02 2025 daemon.info dnsmasq[7350]: 177 ::1/50909 cached mail.haleysystems.nl is NODATA-IPv6
1320 Tue May 6 11:11:02 2025 daemon.info dnsmasq[7350]: 178 127.0.0.1/50909 query[AAAA] mail.haleysystems.nl from 127.0.0.1
1321 Tue May 6 11:11:02 2025 daemon.info dnsmasq[7350]: 178 127.0.0.1/50909 cached mail.haleysystems.nl is NODATA-IPv6
1322 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 179 127.0.0.1/37652 query[A] rut.teltonika.lt from 127.0.0.1
1323 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 179 127.0.0.1/37652 cached rut.teltonika.lt is 3.120.7.82
1324 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 180 ::1/37652 query[A] rut.teltonika.lt from ::1
1325 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 180 ::1/37652 cached rut.teltonika.lt is 3.120.7.82
1326 Tue May 6 11:11:03 2025 kern.warn kernel: [ 294.465622] REJECT restricted in: IN=br-ifLan2 OUT= MAC=ff:ff:ff:ff:ff:ff:c4:4f:33:e4:6f:d4:08:00 SRC=192.168.144.204 DST=255.255.255.255 LEN=216 TOS=0x00 PREC=0x00 TTL=255 ID=30674 PROTO=UDP SPT=49154 DPT=6667 LEN=196 MARK=0x3f00
1327 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 181 127.0.0.1/47556 query[A] rut.teltonika.lt from 127.0.0.1
1328 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 181 127.0.0.1/47556 cached rut.teltonika.lt is 3.120.7.82
1329 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 182 ::1/47556 query[A] rut.teltonika.lt from ::1
1330 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 182 ::1/47556 cached rut.teltonika.lt is 3.120.7.82
1331 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 183 127.0.0.1/36694 query[A] rut.teltonika.lt from 127.0.0.1
1332 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 183 127.0.0.1/36694 cached rut.teltonika.lt is 3.120.7.82
1333 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 184 ::1/36694 query[A] rut.teltonika.lt from ::1
1334 Tue May 6 11:11:03 2025 daemon.info dnsmasq[7350]: 184 ::1/36694 cached rut.teltonika.lt is 3.120.7.82
1335 Tue May 6 11:11:04 2025 daemon.info dnsmasq[7350]: 185 127.0.0.1/44143 query[A] rut.teltonika.lt from 127.0.0.1
1336 Tue May 6 11:11:04 2025 daemon.info dnsmasq[7350]: 185 127.0.0.1/44143 cached rut.teltonika.lt is 3.120.7.82
1337 Tue May 6 11:11:04 2025 daemon.info dnsmasq[7350]: 186 ::1/44143 query[A] rut.teltonika.lt from ::1
1338 Tue May 6 11:11:04 2025 daemon.info dnsmasq[7350]: 186 ::1/44143 cached rut.teltonika.lt is 3.120.7.82
1339 Tue May 6 11:11:08 2025 kern.warn kernel: [ 299.463430] REJECT restricted in: IN=br-ifLan2 OUT= MAC=ff:ff:ff:ff:ff:ff:c4:4f:33:e4:6f:d4:08:00 SRC=192.168.144.204 DST=255.255.255.255 LEN=216 TOS=0x00 PREC=0x00 TTL=255 ID=30675 PROTO=UDP SPT=49154 DPT=6667 LEN=196 MARK=0x3f00
1340 Tue May 6 11:11:12 2025 daemon.err event_juggler: Failed to send mail

Could someone point me in the direction of a solution?
Should any additional info be required, please let me know.

Kind regards, Richard

To be sure if anything had changed, I reset the configuration to factory defaults again after upgrading to RUTC_R_00.07.14.2.
Regretfully, no change and still the same error.