Hi Community! I use Mailcow a least 3 years. All works fine on PCs and mobile devices. But after last update ALL of my HP MFPs cant send any mail. In logs I see BAD HELO. NOQUEUE: reject: RCPT from unknown[myIP]: 504 5.5.2 : Helo command rejected: need fully-qualified hostname; from= to= proto=ESMTP helo= Only authentificated users can use mail server. No Relay. How I can disable HELO check or something else but stay secure. Thanks.

@"Kobzantsev"#p528 Problem resolved with this topic [Re-enable TLS 1.0 and TLS 1.1](https://mailcow.github.io/mailcow-dockerized-docs/u_e-reeanble-weak-protocols/) Just fucking HP :) only TLSv1.0

Bad HELO

Kobzantsev

Hi Community!
I use Mailcow a least 3 years.
All works fine on PCs and mobile devices.
But after last update ALL of my HP MFPs cant send any mail.

In logs I see BAD HELO.

NOQUEUE: reject: RCPT from unknown[myIP]: 504 5.5.2 <hp-name>: Helo command rejected: need fully-qualified hostname; from=<hp-name@mydomain> to=<hp-name@mydomain> proto=ESMTP helo=<hp-name>

Only authentificated users can use mail server. No Relay.
How I can disable HELO check or something else but stay secure.

Thanks.

Kobzantsev

I FIX this problem with changing name of my HP device, but now this trouble:

13.05.2020, 12:01:49 info disconnect from unknown[myIP] ehlo=1 starttls=0/1 commands=½
13.05.2020, 12:01:49 info lost connection after STARTTLS from unknown[myIP]
13.05.2020, 12:01:49 warning warning: TLS library problem: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol:../ssl/statem/statem_srvr.c:1661:
13.05.2020, 12:01:49 info SSL_accept error from unknown[myIP]: -1
13.05.2020, 12:01:49 info connect from unknown[myIP]

And this problem only from HP MFPs

Kobzantsev

Kobzantsev
Problem resolved with this topic Re-enable TLS 1.0 and TLS 1.1

Just fucking HP 🙂 only TLSv1.0

diekuh

Thanks for reporting back. 🙂