Receiving Mail Very Slow - 1Kb!!

Hi,
This may have been solved somewhere else - but I've search and search but can not find a solution. Please post a link to the thread/post that solves this problem - if there is a solution - otherwise just post solution here.
The Version of Mac Mail we are running is 3.6 on OSX 10.5.8
I seem to have an issue with receiving emails.
I think it is a Mac Mail problem (program) than anything else.
I've tried the internet (Google, Apple Forums) but can't find a solution.
What seems to happen is Mac Mail seems to sit/stall on downloading/receiving emails - especially if they have attachments.
It tries to download them - but instead of going at full speed (say 600Kb) it may download them at 1KB - thus taking for ever to download.
Emails will eventually download but they may take several hours - and all other emails bank up.
The only way I found to fix the problem is to do a restart of the computer - but that may only solve the problem for 5 minutes.
I read that turning "Configure IPv6" to "Off" under TCP/IP - network settings - might help - but it didn't.
This problem is happening on all our iMac computers - OSX 10.5.8.
None of these email accounts sync to an iphone or the like and they all just run one account.
All are running POP accounts.
Downloading the same email from Webmail gives me download speeds I should/would expect where as Mac Mail starts off at a high speed (for about 5 seconds) then basically drops straight away to 1-2Kb download speed.
Surfing the Internet is fine also.
Rang up the ISP by they couldn't shed any light on the situation - saying it was the program than anything else.
Tried changing the account to IMAP - which on the Mac means you have to create a new account which creates its own issues!! This sort of worked but ideally the account should be a POP account.
I have also rebuilt the mail boxes but this didn't seem to help much.
Sending is fine.
Any thoughts would be greatful.

The way i managed to fix it instantly was:
Go into MAIL and PREFERENCES and then in the Accounts list select the account your having problems with (if you have multiple accounts otherwise the account should already be selected)
Click on ADVANCED and at the bottom where it says about AUTHENTICATION POP (APOP) and untick the use SSL box.
Save this when prompted and this should solve the problem.
Hope this helps someone else out there!

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