Can't send mail suddenly - help?

i have had my computer set up with the same isp for a year and suddenly in the last week or so i can't send email. i thought it was a fluke as it would sometimes let me send but now i can't at all. i am getting this error message:
Error
This message could not be delivered and will remain in your Outbox until it can be delivered.
The sender address [email protected] was rejected by the server.
I have also gotten this one:
Message delivery failed
The connection to the server “servername” on port 25 timed out.
You can try to send using a different server. All messages will use this server until you quit or change your network settings.
Send message using: (and then you choose the server)
Is the only outgoing server i can use the one for my isp (which is RCN)? smtp.rcn.com.
I am going crazy. I called RCN and they told me they coudln't give me support since the email accounts are not RCN-based EVEN though they are my provider - they are my school and personal accounts. so weird. any help would be great.
Thanks!

Based on the information you provided, RCN is your internet service provider but you are not accessing an email account and SMTP server that is provided by RCN with the Mail application?
Do you know if the SMTP server for your school's email account or the SMTP server for your personal non-RCN email account is authenticated by your account's user name and password?
RCN should have been able to advise you on this since the timed out on port 25 error message indicates RCN is blocking the use of SMTP servers that are outside of their network (or not provided by RCN) on port 25 and the other error message can mean the same but the rejected by the server error message is an indication this SMTP server may require authentication.
Try the following first.
Go to Mail > Preferences > Accounts and under the Account Information tab for your school's account preferences at the SMTP server selection, select the Server Settings button below.
Enter 587 in place of 25 in the Server Port field and when finished, select OK to save the changed setting.
Repeat for your personal, not RCN email account.
If this does not work, you can add RCN's SMTP server to the Mail.app and select/use RCN's SMTP server to send messages with these accounts.

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Can't send mail suddenly - help?

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