Problem with SMTP server

Question

linux

Please help me with the following issue.
SMTP is not sent - mailing to users.
If you send single messages, everything is fine.
The SPF record is configured, the Exim mail daemon, login and password access (ESMTP), I read information about the error on the Internet, but did not understand what it was about, the error is not mentioned in Runet.
Letters from the site leave without problems. We use ePochta Mailer for mailing.

no IP address found for host 5x164x130x58.dynamic.samara.ertelecom.ru (during SMTP connection from [5.164.130.58])
SMTP call from (5.164.130.58) [5.164.130.58] dropped: too many nonmail commands (last was "NOOP")
no IP address found for host 5x164x130x58.dynamic.samara.ertelecom.ru (during SMTP connection from [5.164.130.58])
SMTP call from (5.164.130.58) [5.164.130.58] dropped: too many nonmail commands (last was "NOOP")
no IP address found for host 5x164x130x58.dynamic.samara.ertelecom.ru (during SMTP connection from [5.164.130.58])
SMTP call from (5.164.130.58) [5.164.130.58] dropped: too many nonmail commands (last was "RSET")

Please help.

Answer 1

In your case, most likely a crookedly written mailer program. Apparently, trying to control the speed of sending messages, she does not break the connection with the SMTP server, but stupidly waits on the line sending NOOP. Exim doesn't consider this operation allowed, so it closes the connection after a while. You can, of course, increase the limit on the number of such operations (smtp_accept_max_nonmail = 1000 for example), but you can disable this check altogether:

smtp_accept_max_nonmail = :

or disable for a specific host:

smtp_accept_max_nonmail_hosts = ! 192.168.22.3

(where 192.168.22.3 is the IP address from which the mailer connects)

Answer 2

Try using Postfix instead of Exim

Answer 3

Problem between mailer and Exim? smtp_accept_max_nonmail

Answer 4

The sending server used too many off-topic protocol commands, in this case, NOOP. The receiving server did not like this, he was offended and does not want to accept mail from such a rude person.
To be honest, I don’t understand the logic of the developer who inserted such code into the program at all. Why would NOOP be needed at all?
This is a clear jamb of the sending system. Understand the Exim settings so that it does not flood with NOOPs, or, as it was reasonably advised here, use Postfix.

Answer 5

Contact your provider with a request to register a reverse zone.