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This is interesting. I would suggest trying to first send an email from the web-based rogers yahoo interface (rogers.yahoo.com)
If this would work the problem should be on your computer. Make sure you use the option "SMTP server requires authorization". Also, try using default port 25 instead of 587.
And it would not hurt checking your firewall logs to verify that your software firewall does not block port 587.
To eliminate any virus possibility boot your computer from a rescue disk and run a full scan.
Some people with using pop/smtp for the email with 3rd party clients (thunderbird i know it happened alot), that it seems to lock them out of their email..
If they go and log into their web mail through that interface, they can then send through the other program fine for a while..but then again have to go through the webmail as it locks again after a while... its like its sensing too many requests or something, and wants a login via the webmail, for verification or something.
Some users, have found better luck, using the IMAP server, rather than the PoP and it seems like it doesnt do it anymore.
Upon looing it up.. i dont beleive that one is the cuplrit, it doesnt appear to be a mailer based one.. but it is possible its trying to use your mail connection, and is spamming the port while the program is open.. so rogers is blocking it.
Thats what it does look like from your original message, that either the virus.. or just the mail program.. is just making too many requests so its blocking you (they do this, to prevent peoples PCs to be used to send out spam, etc)