I've got my time right on the dvr. However, the emails it sends are +4 hours.
So recipient get e-mails from the future (timed 4 hours after the real clock).

How can I fix that?

i think the problem there is the time setting for your email.

I don't think so, since when I send an email with same credentials from the same ip as the dvr's using PC mail client, the time is right

Check out your DVR Time zone...

by default it is what d manufacturr's have!!!

Kalp.. :)