Yeah, it needs the right compression (I know its easy to do that format in GIMP when choosing as dds file). The other gotcha is that I think it has to have 2^x dimensions (like 1024x1024 or 2048x2048, which are 2^10 and 2^11)
The lego players can be a bit weird for the weight painting, since they are different shape to a person and so I made Yoda float a bit so his body parts like arms were close enough to the PES skeleton. I also made his whole leg the same type so they walk more like a lego player, kind of.
(I forget where but there was a list of what each weight represented, like left arm, right shoulder, although some are quite obvious.)
fire and air, although they all go through cock.li's mail server which I think is on ovo.sc
Maybe try using another service for critical stuff and try calling up to ask if they're received? It depends on the receiver's email service whether or not they go through, so a gmail might but an outlook might not, for example.
You can also go into settings (if using the web, otherwise find the equivalent on your email program) and enable delivery status notifcation or whatever, which quickly replies to your with a confirmation that the email was accepted. I've not turned this on by default.