Webmail ~ how to access all my plusnet addresses?

[#1]

When I go into webmail I can view only my main plusnet email address.  I would like to be able to access all my plusnet addresses at the same time (e.g. first@username.plus.com, second@username.plus.com etc).
Similarly, when I look into my on line blocked spam folder I only see things blocked on my main plusnet address.  I would like to view them all.
However, I don't want to change my usual download arrangments to my PC, so I have not changed my "catch all status" to on.
Any advice appreciated.
Thanks

[#2]

you can do it With IMAP.  I use Thunderbird.  That leaves the messages on the server for you to download later, yoy can delete them on the server.
Note.  PM dont like you leaving them on the server and have been known to delete them

[#3]

Thanks for reply.  Never used IMAP.  Although I have my own home PC, I very frequently use PCs that are not mine and can't alter the settings or install anything on them.  That is one reason why I want to use webmail.  Would IMAP be able to do what I want?

[#4]

Yes, I have used it in Cornwall - at a pub, Cardigan in a hotel, Oban in a garden centre, Bury St Edmunds at my Sisters
Screen shot below

[#5]

Thanks for a reply.  Excellent.  How do I get IMAP? 

[#6]

Quote from: grecian

How do I get IMAP?

Errr............
I think there may be a slight misunderstanding here. IMAP is just "there" (if implemented by the mail server).
BUT to use it you need to use an email client, not just web access.
Thunderbird is an email client (i.e. a program) as is Outlook Express, Windows Mail, Outlook, etc. etc.
Personally I access loads of nominally web-based email accounts at one time using Windows Live Mail Desktop Client, but like all the above it's a program that you have to install.
Hope that clarifies things. 

[#7]

This was suggested to me in September by spraxyt who gave me the instructions how to set it up.  I prefer it now to webmail whilst I am away from home.  I use Thunderbird as my mail client.

[#8]

Thank you for your various replies, but unfortunately I feel more confused than when I started. 

[#9]

I've found the info that spraxyt sent me and I hope he won't mind me posting it so that you can also find it useful.  Follow the instructions and this will get you set up. ( Remember I said I was using Thunderbird.):
references to Force 9 will be Plusnet in your case.

The settings I have are as follows:
Thunderbird Tools->Account Settings
Click on the Account Name line in the left-hand pane
Entries in the main pane
Account Name - xxxx
Your Name & Email Address have appropriate entries
Outgoing Server (SMTP) has Force9 SMTP relay (Default) for me
The other fields are empty
Click on Server Settings
Server Type POP Mail Server (not an entry field)
Server name is mail.force9.net for me (mail.plus.net for you)
Port is 110
User Name is the name I use to login to the Member Centre
Use secure connection: Never radio button is selected
Use secure authentication is *not* ticked
Server settings are (from the top) tick, tick, tick, blank, blank, tick
Local directory is a location set up by Thunderbird
The remaining account settings are what one would expect, Security has no entries.
Down at the bottom,
Outgoing Server (SMTP) is set as follows
Click the Force9 SMTP relay (Default) entry, then click Edit
The entries I have are
Description Force9 SMTP relay
Server Name relay.force9.net (yours will be relay.plus.net)
Port 25
Security and Authentication
Tick against Use name and password
User Name: the name I use to login to the Member Centre
Use secure connection
The No radio button is selected, having something else selected seems to be a common mistake.
I created and sent a message
A window opened requesting my password for that username (which is, of course, my Member Centre login password). I didn't tick the "save this password" box, only because I didn't want to.
The message was then sent.

[#10]

Thanks for the help.  i have worked out how to log into plusnet webmail addresses other than my main address, using plusnet squirrel mail. Also how to sift through spam folders.  Suggestions and help appreciated.