There seem to be some strange spam emails doing the rounds, with a body text of "podmena traffica test".. what gives?
It makes a bit more sense if you transliterate it into Cyrillic, which leaves you with a Russlish phrase "подмена трафика тест" and that simply translates as "spoofing traffic test".
The subject is a random spammy one, the originating IP looks like part of a botnet.
I'm pretty sure these are coming through "to" and "from" the same email address, so it may well be someone enumerating mailservers looking for SMTP spoofing protection.. in other words, testing addresses to see if they work and then recording the server's SMTP response.
Why? Who knows.. spammers don't usually care about efficiency if they are using a botnet, because they are not paying for bandwidth or equipment. These type of "probes" are seen sometimes and can be safely deleted.