http://www.guardian.co.uk/technology/2008/may/15/yahoo.spam

A Yahoo security upgrade that caused chaos for thousands of BT customers who use their own domain name to send email has been temporarily removed after protests from users.

The problem arose when Yahoo decided as an anti-spamming measure to stop any emails going through the servers, which it runs for its partner BT, that did not have a matching BT/Yahoo address in the From: field. People who tried to send using their own domain names found the email did not get sent, and received a confusing message saying that they had "error 553" and offering a link where they could "validate their domain".

Neither BT nor Yahoo could give firm figures on how many were affected, though BT confirmed that it was several thousand. The upgrade has now been temporarily removed but will be rolled out again "shortly".

"Problems arose because it affected significantly higher numbers than we expected," said BT. Fixing it was cumbersome and difficult, according to message boards, forums and blogs. Typical of the tales of woe is freelance web consultant and blogger Phil Gyford, who spent many hours sorting it out for his mother (tinyurl.com/2fgo7f).

He says: "BT's new security could be a good idea. Trouble is, they implemented it without telling anyone, then made it fiendishly complex to fix. The issue is even more confused by the apparently pointless partnership with Yahoo."

--- The 'fix' for this is here but see the fix-fix in Phil Gyford's post mentioned above also.

How to Run an Older Program in Windows XP and Vista

BUT, judging by the comments here it might be a waste of time?


XP:

Windows XP's Compatibility Mode.

Open Windows Explorer and navigate to where the program is located. Then...

• Right click on the program file (the .EXE or .COM file).

• Select Properties from the menu that pops up.

• Select the Compatibility Tab in the dialog.

• Change the options so the program opens in Windows 95 or 98 compatibility mode. Note the other options in the dialog as you may have to experiment a bit and change some of them as well.

Vista:

Open an Explorer window and navigate to the .EXE file for the program. Then...

• Right click on the program file (the .EXE or .COM file).

• Select Properties from the menu that pops up (#1).

• Select the Compatibility Tab in the dialog.

• Change the options so the program opens in Windows 95 or 98 compatibility mode. Note the other options in the dialog as you may have to experiment a bit and change some of them as well (#2).

• If this doesn't work, then try checking the "Run the program as an administrator" box (#3). This defeats the security in Windows Vista however and should be a last resort.

For 100BaseTx network you have a limit of 100m of twisted pair (segment length) then a switch, then 5m of twisted pair, then another switch and 100m of twisted pair. So without using a router the furthest apart 2 machines can be is 205m.

10BaseT will work further however.

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