DNS changed and Mail, MSN, Jabber don't connect :S (but Internet runs well)

First of all, sorry for my english, i'm spanish .
My connection to internet was like this (now i've changed)
iMac ->(wifi)-> router1 ->(ethernet)-> router2 -> Internet.
I always used the OpenDNS (208.67.220.220/208.67.222.222) and all my applications connect to internet well.
Two days ago I read about the GoogleDNS (the new service), that they are 8.8.8.8 and 8.8.4.4, so i changed my DNS in the router1 and in the iMac.
It goes really well for two hours. Then, when I rebooted my iMac many services like Mail (IMAP and POP), MSN, Jabber... didn't connect saying that "there is no connection" or "connection refused", but I had internet (and nslookup went well) so safari, skype, spotify... went well and at full speed.
When it was driving me mad I returned to OpenDNS... but they didn't connect yet.
Now, i am connected to the primary router via ethernet, and my iMac has the OpenDNS... and I don't know why, but it still doesn't connect.
Do you have any suggestion? Do you want any log?.
Thanks!
Message was edited by: d4rkb1t

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