451-The server has reached its limit for processing requests from your host.

[mohamed essam]

Dears,

Kindly advise there is domain in our shared server (ex: recipient .com) can't receive from specific domain (ex:sender.com)

when the recipient put we put sender in white list and their MX records ,the problem still exist.

with the below NDR to sender

***********************************
From: Administrator <[email protected]>
Sent: Sunday, January 3, 2016 1:13:00 PM
Subject: [Postmaster] Email Delivery Failure

This is a delivery failure notification message indicating that
an email you addressed to email address :
-- [email protected]

could not be delivered. The problem appears to be :
-- Communications error

Additional information follows :
-- Read timed out

This condition occurred after 30 attempt(s) to deliver over
a period of 94 hour(s).

If you sent the email to multiple recipients, you will receive one
of these messages for each one which failed delivery, otherwise
they have been sent.

**********************

after checking sender logs he noticed that mail server stopped in sender IP address of his mx.

so we think to check connectivity with port 25 from sender to mx of recipient.

*************
recipient mx IP is X.X.X.X

#telnet (x.x.x.x) 25

Trying (x.x.x.x)...

Connected to x.x.x.x.

451-The server has reached its limit for processing requests from your host.

451 Please try again later.

Connection to host lost.
*******************************

Any advise about this issue?

 

[cPanelMichael]

Hello

Could you search for the message in /var/log/exim_mainlog and post the entry here? EX:

exigrep [email protected] /var/log/exim_mainlog

Thank you.

 

[mohamed essam]

I can't test from sender domain, but i cant test from recipient side.


but the sender side send to me this logs that confirm the connection closed from my side( recipient side)


*****************************************************************************************
INFO |1231-115641 564|RetryDeliveryThread-53692358|delivery.SmtpDelivery|C72A63|[email protected]|||Error Code|21040|Read timed out

INFO |1231-115641 564|RetryDeliveryThread-53692358|delivery.SmtpDelivery||C72A63|[email protected]|||Communications error - Read timed out - closing

INFO |1231-115641 568|RetryDeliveryThread-53692358|http.ClientSocketDecorator|C72A63|[email protected]||/x.x.x.x:5678 rcv:498 snt:1060 cdur:1 dur:3

INFO |1231-115641 569|RetryDeliveryThread-53692358|logging.MapReduceLog|C72A63|[email protected]|||MAPREDUCE:MTAOUTSUMMARY|Dom=sender.com|Rcv=724|Err=Read timed out|TlsType=None|IP=x.x.x.x|RejType=21040|Hostname="recipint hostname"|RejCode=0|Time=341269|Dir=Out|QTp=2|Cost=400 |err=Read timed out

 

[cPanelMichael]

The output you provided does not appear to come from /var/log/exim_mainlog. Are you unable to obtain that output from the cPanel server? Do you have root access to the cPanel server?

Thank you.

 

[mohamed essam]

i don't have access to check from sender side.

do you think this problem from sender side or from recipient ?

 

[cPanelMichael]

You don't have to check /var/log/exim_mainlog on the sender's server. You can check on the cPanel server when logged in as "root" via SSH.

Thank you.