Since last week Crysys and I we were analyzing all the problems reported by you.
This analysis showed that the new server we bought couple of weeks ago just put more problems over the table. In short, the backend scripts cannot support the ammount of traffic sent by the new server.
With the current backend hardware the only solution that we have is to port the current scripts from Ruby to Perl and try also to simplify them. During last weekend i made this job and my first goal was to have them working at least 24 hours without problems.
Today we reach 34 hours working without problems! But before commit the new scripts scripts into our mercurial repository i rather make some cosmetic changes and add some traces.
I would like to let you know that we will keep PookMail under stronger surveillance the next incoming weeks in order to be sure that the service is stable.
Finally, I would like to give thanks to everybody who spent their time just sending their suggestions, comments and errors reports. That was very appreciated by us.