Poblems sending emails

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gusarg81
Posts: 33
Joined: Sun 18. Jul 2021, 02:20
Location: Argentina
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Poblems sending emails

Post by gusarg81 »

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.
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Florian
Keyweb AG
Posts: 1243
Joined: Wed 20. Jan 2016, 02:28

Re: Poblems sending emails

Post by Florian »

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
Mit freundlichen Grüßen / Best regards
Florian Cheno

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