Configuring Eudora 7 For Use With No-IP™ Alternate Port SMTP Service
Oh Eudora, how you brought the GUI email client to our desktops! But for so long did you languish without an update! Alas, Eudora 7 gives us an easy option to comply with the standards for email submission. The setup is a fairly straightforward process, no eudora.ini file editing! So let's begin.
Create your POP account in Eudora as usual. There is no need to enter anything in the SMTP Server field for now. Here is a screenshot of what mine looks like:

Next, create another persona for Alternate-port SMTP. To do this, go to the Personalities tab and right-click. Select New.... Choose Skip directly to advanced account setup and click Finish. Configure this persona to look look like mine, except remember to use your own username!

This is important! On the Incoming Mail tab enter noip-smtp for the Server: field. Unintuitive, I know, but Eudora won't send your username properly without it! Here's a shot of my configuration:

We're nearly done now. From the menu choose Tools -> Options..., then Sending Mail for SMTP Relay Personality choose your newly created No-IP Alt-port SMTP persona. Click OK. Another screenshot of what mine looks like:
Now try to send a message with your Dominant persona (or whatever persona you're configuring this for). You'll be prompted for your No-IP Alternate-port SMTP password. It doesn't look like the correct username, but it will leave off everything after the last @ sign. Enter your password and watch Eudora send the message. Here is a screenshot of the Enter Password dialog for me:
Yes, I know, No-IP advertises an alternate port of 3325. This is because No-IP wanted to provide a port that was truly alternate, that currently had no other purpose. Port 587 is the mail submission port, and, in the tradition of supporting standards and for your convenience, we also provide it.
So use Eudora and promote the legacy!