Does it your SMTP server require authorization? (Please check the Account settings in OE).
Vlk, mine, for sure, requieres authorization.
I have three servers. The one I'm connected (and the, no authorization needed) I can send and receive. One of the other which needs authentication, I can and other, the third, not...
Stranger than this, at other computer, I tried the same email, avast and firewall configurations. The third (the problematic one) can send and receive