I've never heard of Namailu so I assumed that it was a virus. I couldn't detect a malicious payload though, and further investigation indicates that this is a wannabe dating site that appears to be promoting itself through spam.
Clicking through the link leads to https://www.namailu.com/Smith.Sarah.206
The spam messages come from a range of IPs that are also used to spam out promotional material for a site called dirtyemojis.com (using a redirector of dirtyemojis.ru). The spam is sent from a range of Chinese IP addresses, including:
In each case the "From" address is fake, for example:
Shana Felton [firstname.lastname@example.org]
Nestor Blackwell [email@example.com]
Shirley Webb [firstname.lastname@example.org]
Mauricio Lundy [email@example.com]
Edward Ybarra [firstname.lastname@example.org]
A quick search of the body text of the message shows that it has been spammed out quite widely.
There are no contact details on the website, but the "User Agreement" page says that it is owned by Namailu Online Limited of New Zealand. It turns out that the New Zealand Companies Office offers very good information, and this is actually a real company.
The two directors listed are:
Philipp Rudolf RIPA
26 Whitehills Road, Rd 1, Silverdale, 0994 , New Zealand
111 Pilkington Road, Panmure, Auckland, 1072 , New Zealand
Incidentally, if you want to serve legal papers then the Pilkington Road address is the one to use. There aren't many people by the name of "Philipp Ripa" or "Rudolf Sayegh" in New Zealand, that is for sure.
A look at their Facebook page shows some information about the product being in development, but no other real details. Their spares Twitter page at @namailu shows they have four followers. I am one of them.
I'm going to be charitable and suggest that the people running Namailu have contracted another party to do the spamming and are possibly unaware of what is going on.
However, this clueless approach does not bode well for a site that deals in highly personal data and my personal opinion would be to give this particular outfit a very wide berth.