Yahoo Mail - "Cannot Send Message"

Hello,
I am having issues with Yahoo mail and sending messages. It seems to happen specifically while trying to send emails with attachments. I receive an error that says "Error sending message" and alludes to a connection problem but I don't see any detailed error information with it.
The MacBook connects either directly to a Ethernet cable or wireless to a NetGear WGR602.
I don't know much about Safari but are there are settings I can modify to see if the issue can be resolved? The user says that she does not have this problem at home but only when she is on this network.
Has anyone encountered this and have any tips I can try to resolve it? When I get some time to sit and work on the laptop I will check to see what versions all of the software is at. Right now I have only had a few minutes to sit at the MacBook and observe the errors.
Thanks in advance!

Short of installing Firefox or moving directly to Mac Mail, is there anything I can look to do either with Safari or the Yahoo interface itself?
Not really. If the user has a free Yahoo! Mail account, they can't use Mail to send/receive anyway; they'd have to pay $20 a year for a Yahoo! Mail Plus account for that privilege.
Yahoo! has never made any real effort to be standards-compliant, much less compatibile with Macintosh, which is why some features work only when using Firefox on a Mac (because Firefox is the second-most popular browser for Windoze). The only other thing the user could do is use the Yahoo! Help pages for Yahoo! Mail and send them an email using their web form about their problem and see if they can address the issue on their end, since it is their problem. He/She should make it crystal-clear that they are using Safari for Mac OS X, and if they get a boilerplate reply about IE, reply to that and ask for a supervisor.
They could also try using the Develop menu in Safari to select a different User Agent in the hope that spoofing an IE browser will make it work, but there's no guarantee with that. They could just resign themselves to using Firefox when using Yahoo! Mail, or they could also try switching to the "Classic" Yahoo! Mail interface, which will have some limitations in features, but it may also avoid this problem when sending some email.
Mulder

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