Problem sending out emails

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Operating Systems Linux Debian Problem sending out emails
# 1  
Problem sending out emails


Our email relay server is a debian server.
The application team in our company regularly receives email alerts from one hpux server (which is routed through the email relay server).
Today we had problems whereby our company's email recipients are not receiving email alerts from the hpux server.

When I checked the logs of our email relay server (mainlog) :

2017-08-20 14:16:53 1djJXZ-000GF4-3D <= H=( [] U=root P=esmtp S=575
2017-08-20 14:16:53 1djJXZ-000GF4-3D ** R=dnslookup T=remote_smtp: SMTP error from remote mail server after initial connection: host [1nn.1nn.2nn.nn]: 554 5.7.1 You are not allowed to connect. Please refer to for further information.
2017-08-20 14:16:53 1djJXZ-000GF8-KZ <= <> R=1djJXZ-000GF4-3D U=Debian-exim P=local S=1643 T="Mail delivery failed: returning message to sender"
2017-08-20 14:16:53 1djJXZ-000GF4-3D Completed

I googled for solutions, and the solutions provided was that :

If the spam filter determines that the sender's IP address has a "negative reputation", it will reject the mail with a 554 5.7.1 error.
However, when I checked the ip 1nn.1nn.2nn.nn in Symantec's IP investigation page (IP Reputation Investigation), it says that :

The IP address you submitted, 1nn.1nn.2n.nn, does not have a negative reputation and therefore cannot be submitted for investigation.
How can resolve this problem?

Moderator's Comments:
Mod Comment For security reasons it may not be wise to publish account / personal / company data in clear text. You better obfuscate them.

Last edited by RudiC; 08-20-2017 at 06:43 AM.. Reason: Obfuscated possibly confidential data.
# 2  
You are having problems with Symantec - meaning that you animalware is blocking the connection from HPUX to the mailserver. You can start sendmail on your HPUX box to act as a mailserver for the email leaving that box.

This may be of help -- Sendmail - Configuration -
# 3  
The receiving mail server runs Symantec anti-virus/anti-spam and has blacklisted your mail relay server.
You must visit the given Symantec portal and ask for removal from the blacklist.
You mention a HP-UX server. HP-UX by default runs sendmail daemon that unfiltered listens to port 25 i.e. is open for spammers. It must not be reachable from the Internet! Additionally its listener should be restricted to localhost. Then it still can send mails from local users.
AFAIR the instruction for HP-UX:
in /etc/mail/ search for the line
O DaemonPortOptions=...

and add ,Addr= to the line.
To activate the new config run
/sbin/init.d/sendmail stop
/sbin/init.d/sendmail start

Last edited by MadeInGermany; 08-20-2017 at 05:34 PM.. Reason: how to restrict port 25
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