Maybe I am being stupid (can't find a reason anywhere), but can someone please explain why I am getting all of these localhosts/Domains which I know nothing about nor do the relaying IPs mean anything to me. Are these hosts/domains from picked up from spam that I have reported?

I have two other mailhosts on the page Eclipse and Gmail (which I set up)
Below is the Localhost only Mailhost section (** to hide email address)

Thank you in advance.

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Mailhost name: Localhost only
Email address: **@**.eclipse.co.uk
Hosts/Domains: -gaston
-sniper15
-netmed
-athos
-elscof9
-surfnix.gallia
-ciqxgw
-localhost
-impulse
-surfnix
Relaying IPs: -213.86.137.65
-192.168.168.102
-127.0.0.1
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Have a look at FAQ Entry: MailHost Configuration problems, maybe have a glance at A little confused... which covers some area about multitudinous and "unexpected" hostnames, come back with any further queries.