[exim] received from is ip address and not domain name

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Autore: Chip
Data:  
To: exim-users
Oggetto: [exim] received from is ip address and not domain name
Hello,

Beginning exim user here.

Exim version 4.85 on Centos 7.

Running into problems because the first "received from" in the mail
contains a line similar to the following in the received headers (the
public ip address of the sending machine) so that this is tagged by spam
assassin on the receiving machine because it contains an IP address
rather than a domain name in the helo portion. The following happens
before the email even goes out, within the local network:

Received from localhost ([127.0.0.1]:37656 helo=xx.xx.xxx.xx) by
host.domain.com

Can't understand why on a different machine I administer the first
received froms look like the following and are not being tagged as spam
by the end receiver:

Received from localhost.localdomain ([127.0.0.1]:50701
helo=www.domain.com) by who.domain.com

Any help would be greatly appreciated an the reason for an ip address in
the helo rather than the domain name.

Really scratching my head here.