KeyHelp Community

Hi,

I've installed (fresh install) some time ago a server (Ubuntu 20.04) with keyhelp to a client (We have a Keyhelp with Ubuntu 20.04 as well, working just fine).

Now, when I try to send an email from one of the hosted domain from my client server (to, for example, my server), my server replies with:

Apr 1 15:47:34 server postfix/smtpd[4190007]: connect from unknown[190.210.88.113]
Apr 1 15:47:34 server postfix/smtpd[4190007]: NOQUEUE: reject: RCPT from unknown[190.210.88.113]: 450 4.7.25 Client host rejected: cannot find your hostname, [190.210.88.113]; from=<mfranco@proyectopuravida.org.ar> to=<gustavo.diaz@gdnet.ar> proto=ESMTP helo=<server.proyectopuravida.org>
Apr 1 15:47:34 server postfix/smtpd[4190007]: disconnect from unknown[190.210.88.113] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 rset=1 quit=1 commands=6/8

Now, from our server, we can send emails just right to everywhere.

The only difference in my client server, is that another domain has custom MAIL DNS records that points to Gmail, but this one (proyectopuravida.org.ar) does use the local email server.

It sound like there is a problem with DNS maybe, right?

Thanks in advance.

Hello,

the R-DNS of IP 190.210.88.113 is not consistent ( Forward and reverse lookup do not match). So the mail is declined