Downloaded Mozilla Thunderbird, and am having an error message when I hit send/receive for it to acquire my yahoo email account. My main email account is working fine - my yahoo is an alternate, but I want Thunderbird to access both accounts and pull my emails into it - not a big fan of web-mail, and Windows 7 doesn't support Outlook program. Any suggestions?

Not enough information.. How do you send mail, using a browser or email client? MS Edge, IE, Chrome or Firefox would be a browser. Mozilla Thunderbird or other programs would be a email client.

What is your email address? I don't need username, just the @yahoo, @gmail, or whatever.

"parameters or out" isn't a very good description of the error message..

Much more common is a sending issue. Often you have to send through your ISP server, contact them for what that server is, if you have sending issues.

I found directions for Outlook, which should be similar to Thunderbird:

Look closely at requires authentication settings....

Note: You must be a Yahoo! Mail Plus user to read Yahoo! Mail in an email reader program such as Microsoft Outlook. Click here for information about subscribing to Yahoo! Mail Plus.
To read your Yahoo! Mail Plus using Microsoft Outlook 2002 or 2003, follow these steps:

1. From the Tools menu, select Email Accounts.
2. Select Add a new email account and click Next.
3. Select POP3 and click Next.
4. Enter the following information:
   • User Information
     
     Your Name: Type your name as you'd like it to appear when you send an email message.
     
     E-Mail Address: Type your Yahoo! Mail Plus email address (for example, [email protected]).
   • Server Information
     
     Incoming mail server (POP3): Type plus.pop.mail.yahoo.com.
     
     Outgoing mail server (SMTP): Type plus.smtp.mail.yahoo.com.
   • Login Information
     
     User Name: Type your Yahoo! ID (your email address without the "@yahoo.com").
     
     Password: Type your Yahoo! password.
   • Select the Remember Password checkbox if you don't want Outlook to prompt you for your password each time you check your mail.
   • Do not select the Require logon using Secure Password Authentication (SPA) checkbox.
5. Click More Settings. The Internet E-mail Settings dialog box appears.
6. Select the Outgoing Server tab:
   • Select the My outgoing server (SMTP) requires authentication checkbox.
   • Make sure that Use same settings as my incoming mail server is selected.
7. Click the Advanced tab:
   • Under Incoming Server (POP3), select the This server requires an encrypted connection (SSL) checkbox. The number in the Incoming Server (POP3) field usually changes automatically from 110 to 995. If it doesn't, type 995.
   • In the Outgoing Server (SMTP) field, type 465. Under Outgoing Server (SMTP), select the This server requires an encrypted connection (SSL) checkbox.
   • If you want to save your Yahoo! Mail messages on both the Yahoo! Mail server and on your computer, select the Leave a copy of messages on the server checkbox. If you want your messages to be deleted from the Yahoo! server once Outlook has downloaded them onto your computer, leave the box unchecked.
     
     Note: After your messages are deleted from the server, we cannot retrieve them.
8. Click OK to close the Internet E-mail Settings dialog box.
9. Click Finish to close the Add New E-mail Account dialog box.
10. Click Close to close the Account Settings dialog box.

Troubleshooting tips
If you still can't send Yahoo! Mail from Outlook, you might be accessing the Internet through an ISP that is blocking the SMTP port. If this is the case, try using port 587 when sending email via Yahoo!'s SMTP server. To make this change:

1. From the Tools menu, select Account Settings. The Account Settings dialog box appears.
2. Select your Yahoo! Mail Plus account and click Properties. The Change E-mail Account dialog box appears.
3. Click More Settings. The Internet E-mail Settings dialog box appears.
4. Click the Advanced tab.
5. In the Outgoing Server (SMTP) box, type 587.
6. Click Apply, and then click OK to close the Internet E-mail Settings dialog box.
7. Click Close to close the Account Settings dialog box.

Try switching your web browser. Mozilla to iExplorer or iexplorer to Mozilla. If still not then download Yahoo Messenger and try login there. Once successful it will show you a message saying XXX mails in your account click on that and you are in. If anyhow you have not received any message, ask you friend to send you an email to your blocked account and within no time you will get the mail and the message. Click on the message and Viola you are in.

You need to open Internet Explorer and add Thunderbird as your email program. Click Tools > Internet Options > Programs tab > E-mail: Select Mozilla Thunderbird from the drop down.

Hi, can you try this on another browser like Firefox?
Here's the link to it:
http://www.mozilla.org/

Also, it looks like Yahoo are now checking the verification of your account before you can use the SMTP service.
You need to do this..
http://help.yahoo.com/l/us/yahoo/mail/original/manage/sendfrom-07.html

Do you have paid membership for the Yahoo services ?
As I know it will be only then available if you have Paid membership.. for free user Yahoo did not provide email Snynchronising with Outlook or Thunderbird.