[Exim] "failed to find host name from IP address"

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Autor: Jerzy Wolinski
Data:  
A: exim-users
Assumpte: [Exim] "failed to find host name from IP address"
Does "refused relay (host) to <qqq@???> from <xxx@???> H=(LocalHost)
[1.2.3.4] (failed to find host name from IP address)" in my server rejectlog
mean that:

1. My server has no valid rev DNS.

or

2. 1.2.3.4 trying to relay mail through my server has no valid
rev DNS