sending plusnet email when not logged in via plusnet

[#1]

Simple question.
If I'm located elsewhere than home so using a different house connection which is not on Plusnet or indeed BT can I still send/receive emails via my email client on my laptop from my Plusnet address as normal or would I need to log in to the webmail interface to receive/send.
(I'm asking as I've heard that some ISP's block you from sending if you are not logged in/using your connection)

[#2]

Similar issue from another issue in this forum today: http://community.plus.net/forum/index.php/topic,132140.0.html
You'll find the information you need there.

[#3]

Ah - thank you indeed for the info.