I can't send e-mails, but I receive them OK

I have a wireless LAN. Both computers can't send mails. They receive mail OK. I can't either use webmail when it carries attached files.
Internet os OK
receiving e-mails is OK.
Cofiguration of accounts is OK.
the problem is only with outgoing mail with attachments
I guess it is something related to windows 2000 (security...)
can anyone help?

 

 

 

 

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