POP3 radio button in My Account - Domain Names

[#1]

Hi 

I am new to Plusnet so this has probably been answered before.

I have my domain hosted by Plusnet, In MY Account under Domain Names - configure there are 3 buttons to do with email settings. One is marked POP3, I don't know what this does, ( I understand the other 2) I use IMAP to collect my mail. Any help welcome

Thanks  

[#2]

You should leave it on POP3 if you use IMAP (I know how that sounds).
From memory, the other two options are for SMTP delivery to a specified IP address and manual configuration of MX records.