3CX Fax - Inbound (Debian)

[OS-Milton]

Faxes received and sitting in:

/var/lib/3cxpbx/Instance1/Data/Fax/Faxes/Sent

Faxes are never actually sent via email.

Welcome emails send fine and go through -
PBX is local
Relay was non issue for Welcome emails -

however found in
/var/lib/3cxpbx/Instance1/Data/Logs
3cxSystemService.log

was showing a relay denied error for Fax Transmission..

odd that Fax would send email a different method than the welcome emails!?!

fixed any relay issues on server and verified all relay allowed..
due to relay issues had to reboot the server - console gui bug after relay denied errors blocked console
commands to restart gui services all failed to get gui back.
reboot of server was only solution - but worked.

still no faxes - but still showing up in
/var/lib/3cxpbx/Instance1/Data/Fax/Faxes/Sent
PDF/TIF/XML all three there...

Problem with the log 3cxSystemService.log
doesn't update very often...
going to dig into system logs and locate current errors /var/logs and see if there are errors in there that I can find related to STMP relay...
wonder if its trying to send FAX out a different Relay thus causing issues -
I block outbound 25 and it shouldn't be going to some random relay -
It should follow Settings > Email settings
have custom there and those work .. notifications and welcome all verified operational.

----
thx - sorry for quick typing info.

 

[JohnS_3CX]

Hi,

You can set logs to verbose and manually tail the log to see it live update.


You did not say what mail server you used, but from what I gather you have a custom mail server set in 3CX

Have you tried using the 3CX SMTP instead of your own mail server just as a comparison?

If your own mail server is rejecting the relay, have you checked the logs of that server?

 

[OS-Milton]

no because I block outbound SMTP 25 -
updated relay issues that might be possible on my exchange server..

but why do normal emails flow from 3CX with no errors -yet FAXes do not?
would appear FAX is sending using a different Email Server and getting blocked..

Which log would track - as service log isn't updating
Currently checking and manually pulling faxes out of Fax/Faxes/Sent Folder

to update logging on 3CX - appears would have to restart server services? to set for better verbose logging?

--
Updated to Verbose and restarted services..
- checking and seeing what I can see...
......
Can see fax arrive in systemservice.log

Fax /var/lib/3cxpbx/Instance1/Data/Fax/Faxes/ToSend/fax_xxxxxxx_no2.tif will be converted to /var/lib/3cxpbx/Instance1/Data/Fax/Faxes/ToSend/fax_xxxxxxx_no2.pdf pdf was created successfully /var/lib/3cxpbx/Instance1/Data/Fax/Faxes/ToSend/fax_xxxxxxx_no2.pdf will be sent to [email protected]

No SMTP Data shown - mail not arriving

 

[OS-Milton]

found the error - typo in fax address in domain.
what is odd is that it would have been found with a simple SMTP log in 3CX...
instead had to dig through exch tracking logs to find it, saw an odd relay and there it was..
address was forwarding due to typo... doh..

my fault but crazy that there really aren't much for SMTP logs even in verbose.

 

[JohnS_3CX]

Glad to hear you were able to find the issue.

Regarding "No SMTP Data shown - mail not arriving":

It's not so as odd as you might think: the mail client in the PBX will send the email to the mistyped address, and so long as the transmission is complete, the system remains unaware that the there was a typo because it was delivered to the mail server.

The mail server may then try to reply to the mailbox that the PBX is using (to inform the owner that the mail to the final recipient was undelivered) but this is beyond the scope of the PBX. That's why I recommended you check the logs on the mail server too since the mail server may receive the transmission from the PBX just fine, but may not be able to send it out to its final destination (due to filtering, typos, policies, stuck queue etc)

The 3CX logs will only show if the mail transmission failed (ie. mail server unreachable) and would most likely appear in the management console log file. It would also fail if you press the test button in the SMTP settings. But for anything else beyond that, you have to consult the mail server logs since the only thing the PBX will do is deliver it to the mail server and what happens next is beyond the control of your PBX.