I'm setting up a new PC for my mother-in-law as a surprise for her birthday next week, and I'm trying to configure WLM.  I can set up her Orcon account no problems, and it syncs okay, but when I go to send an email it returns a 550 error.  I've got the account type set as POP3, using the settings from the Orcon website, with port 110 for POP3 and 25 for SMTP.  I've checked the password and login with webmail and its fine there, but when I try and send an email it returns the error message.

Is it because I'm connecting through Snap at my house as opposed to Orcon, or does that make no difference?  What else could it be?