Netstat results - interpretation?

These same spammers are always camped out on the same ports. Any idea what is actually happening here?

tcp 0 0 host.name:4149 mail.realbizopps.cNetstat results - interpretation?mtp ESTABLISHED
tcp 0 0 host.name:4132 mail.realbizopps.cNetstat results - interpretation?mtp ESTABLISHED
tcp 0 0 host.name:3971 smtp06.freeprizeclNetstat results - interpretation?mtp ESTABLISHED

Thanks....

(desperately trying to kill my ignorance) Netstat results - interpretation?

 

 

 

 

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