[Dimaz]

2 Strabo
You have 2 options
1) Change e-mail (if you have gmail account, use it - never saw the problem on gmail but quite often with mail.ru).
2) If you're familiar with hex editors you can manually repair the file. The problem comes from the fact that last 2 or 4 bytes of the trn contains checksum wich gets truncated in some cases by some mail servers. When I had the problem on mail.ru box I asked the host to send the trn in archive and compared 2 files, and if I remember right the last 0x00 was missed from corrupted. Not sure, however, about that last part, but I was able to repair the next corrupted file in this way.