I've been using it for years without a problem. I now have a Samsung notebook with a 3 Network dongle. I have loaded Eudora on it and can receive mail, but it always fails to send, with the following message:
"Error getting network address for "xxxx.xxxx.com". cause: requested entry not found (11004)."

I have cross-checked the setup for sending mail with my desktop and they are exactly the same. Seems to me as if the 3 Network can't find the outgoing SMTP server, but haven't a clue why.
I have scoured the web for solutions, but with no luck.  :(

Anyone on here got some advice? :-? 

Thast because your outgoing email server needs to be set to the Three one.

The Three SMTP server is usualy:

Server: smtp-mbb.three.co.uk
Encryption: None
Server port: 25

Marks DTM Calib wrote on 31. Mar 2011 at 11:33:

Thast because your outgoing email server needs to be set to the Three one. The Three SMTP server is usualy: Server: smtp-mbb.three.co.uk Encryption: None Server port: 25

No joy, Mark, but thanks anyway. :(  :y

Cracked it: Change outgoing port to 587 and uncheck the authentification box. :y :y

Nickbat wrote on 31. Mar 2011 at 12:45:

Cracked it: Change outgoing port to 587 and uncheck the authentification box. :y :y

I was just about to tell you to try that. ::)

Most networks with DHCP users will block outgoing port 25 (or redirect to their own SMTP servers) for those DHCP ranges to stop those IPs getting blacklisted, as its a PITA and fecking expensive for a company to unblacklist an IP.

The likes of Spamhaus demand a $300 'donation' for companies to remove an IP from their blacklists...  ...and they are just 1 blacklist provider ;)

Using alternative ports will allow you to access your own SMTP server, though invariably, if you are coming from a foreign network, it will require authentication.