Mail won't send emailwhile connected to Ethernet, only over wifi

Here it goes.
I have an iMac 21.5-inch, Mid 2011, with Mac OS X Lion 10.7.4. The issue I have is that when I try to send an email, using Mail, from my company's account it will not do so while the computer is connected to Ethernet.
If I go to network settings and disable that option, connecting trough Wi-Fi, it sends the emails like a charm.
Has anyone experienced something like this?

If you're on the company network, you should ask the network administrator for help.

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