Helo command rejected: need fully-qualified hostname being in a home network

Hello,

I have configured a JPA James Server compiled from the current sources 
using postgresql 11 as database, but it is not working fine yet. The 
configuration is adapted from the one that gets installed for the JPA 
Guice case. The security setup with SPF, DKIM and DMARC, follows what is 
described at https://dmatthews.org/java_email.html. My gmail account can 
receive email successfully from this server. That means the DNS 
configuration seems working. But still there is a problem sending email 
to other servers. For example, trying to subscribe to the james-dev 
developer list, the server complains:

Error message:
504 5.5.2 <localhost>: Helo command rejected: need fully-qualified hostname

To: [email protected]
DKIM-Signature: a=rsa-sha256; 
b=N9CmFtScWt+SbPwvUrzOqVN3hS+COdBX2OyGSYl9IPbOZ7ek/AcCOpsW7Arhp75fPrIg0PfzrnTjjLOvfhz4ZHVyiCk0m5ydFMOmSSWyMVT6vwrocK0UPPSpKKiXj3e3hM4h0Dg75hLH9faJM1Zin4VN1ITlhgYgs8aofj6PmBY=; 
s=202011; c=relaxed/relaxed; d=klug.es; v=1; 
bh=frcCV1k9oG9oKj3dpUqdJg1PxRT2RSN/XKdLCPjaYaY=; 
h=Message-ID:Date:Subject:From:To:MIME-Version:Content-Type;
MIME-Version: 1.0
Received: from x4db45a08.dyn.telefonica.de (EHLO [192.168.1.10]) 
([77.180.90.8]) by bpir2 (JAMES SMTP Server ) with ESMTPA ID -2083659533 
for <[email protected]>; Sun, 29 Nov 2020 18:33:35 
+0000 (UTC)
Message-ID: <[email protected]>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 
Thunderbird/68.10.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Content-Language: en-US


The setup uses Dynamic DNS where the james server is behind the router, 
and the router is forwarding ports 25, 587 to the james server.

I have tried a few changes on both james/conf/smtpserver.xml (like 
<helloName autodetect="false">bpir2.klug.es</helloName>), and at system 
level so hostname --fqdn returns bpir2.klug.es. But no success in 
subscribing. Is there any suggestion on what to try here ?

Thanks,

Pablo