I cannot send email to using yahoo account

Here is the info you need from Yahoo.

Incoming Server - imap.mail.yahoo.com
Outgoing Server - smtp.mail.yahoo.com
Incoming Port - 993 (requires SSL)
Outgoing Port - 465 (requires SSL/TLS)
Username: full email address (example: [email protected])
Password: the password you login to Yahoo with.

If you still can't send Yahoo! Mail from your email program, 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:

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

How do you access your Yahoo mail? Is it via the browser (www.yahoo.com) or via MS Outlook?

If you're having a problem of sending/receiving emails while using the web browser, you may want to delete old and unnecessary emails. You could have reached the storage limit of your email account.

But if your using an Outlook, you need to double-check the account settings. Make sure that you have the correct user name, password, incoming and outgoing servers, incoming and outgoing ports.

If you setup your email account using the POP protocol, you may use these server ports:

Incoming: 110 or 995
Outgoing: 25 or 2525, or 587, or 465 (SSL)

For IMAP:

Incoming: 143 or 993
Outgoing: 25 or 2525, or 587, or 465 (SSL)

If the same problem occur, you may try to delete your account and recreate it. Please bear in mind that if you deleted your account and recreated it, some emails may no longer appear or get downloaded.

Thank you and good luck!

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.

If you can successfully receive e?mail messages, but can't send messages, then Windows Mail is having problems connecting to the outgoing e?mail server that's used to send messages. These are likely possibilities:

• If you've never been able to send e?mail successfully using Windows Mail, your e?mail account is probably not set up properly. First, follow the steps to verify your e?mail account information in the "I can't receive e?mail" section of this help topic. If you verify that your e?mail account information is entered properly, you might need to change your authentication settings so that when sending mail, you sign in using your e?mail user name and password. Check with your e?mail provider to see if it requires authentication for sending e?mail.
  To use authentication when sending e?mail
  1. Open Windows Mail by clicking the Start button , clicking All Programs, and then clicking Windows Mail.
     
  2. Click the Tools menu, and then click Accounts.
     
  3. Under Mail, click your e?mail account, and then click Properties.
     
  4. Click the Servers tab, and then, under Outgoing Mail Server, select the My server requires authentication check box.
     
  5. If the account information that you use to send e?mail is not the same information that you use to receive messages, click Settings, click Log on using, and then enter the user name and password that you use to send e?mail.
     
• Many Internet service providers (ISPs) require you to be directly connected to their network to use their outgoing e?mail servers. If you're using a mobile PC and connect to the Internet using a different ISP (such as when using a wireless connection in a hotel), you might be able to receive, but not send, e?mail. Some ISPs will allow you to send e?mail when connected to a different provider if you use authentication when sending. Follow the previous steps to use authentication when sending e?mail. If your ISP doesn't allow this, you'll need to find out the name of the outgoing mail server for the ISP you're currently using, and then change the settings in Windows Mail to use it.
  To change the outgoing mail server settings
  1. Open Windows Mail by clicking the Start button , clicking All Programs, and then clicking Windows Mail.
     
  2. Click the Tools menu, and then click Accounts.
     
  3. Under Mail, click your e?mail account, and then click Properties.
     
  4. Click the Servers tab, and then enter the new mail server in the Outgoing Mail (SMTP) box.
     
  5. If the new outgoing mail server requires authentication, under Outgoing Mail Server, select the My server requires authentication check box.
     
  6. Click Settings, click Log on using, and then enter the user name and password for the outgoing mail server.
     

Here’s how you can read your Yahoo! Mail Plus email using Outlook 2007:

1. From the Tools menu, select Account Settings.
   
   Note: If you do not see Account Settings, place your cursor over the two arrows at the bottom of the list to display more choices.
2. On the E-mail tab, click New. The Add New E-mail Account dialog box appears.
3. Select the Manually configure server settings or additional server types checkbox. Click Next. The Choose E-mail Service screen appears.
4. Select Internet E-mail, and click Next. The Internet E-Mail Settings screen appears.
5. Complete the fields as follows:
   • 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]).
     
     Account Type: Select POP3 from the pull-down menu.
     
     Incoming mail server: Type plus.pop.mail.yahoo.com.
     
     Outgoing mail server (SMTP): Type smtp.mail.yahoo.com.
   • 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.
6. Click More Settings. The Internet E-mail Settings dialog box appears.
7. 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.
8. Click the Advanced tab:
9. • For Incoming Server (POP3), select the This server requires an encrypted connection (SSL) checkbox. The number in the Incoming Server (POP3) field automatically changes 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.
   • Next to Use the following type of encrypted connection, select SSL from the pull-down menu.
   • If want to keep a copy of your email messages on the Yahoo! Mail server, select the Leave a copy of messages on the server checkbox. If you want to delete your messages from the Yahoo! Mail server after viewing them in Outlook, leave the box unchecked.
   • 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 after Outlook has downloaded them onto your computer, leave the box unchecked.
     
     Note: After your messages are deleted from the server, we cannot retrieve them.
10. Click OK to close the Internet E-mail Settings dialog box.
11. Click Next to continue. The Congratulations screen appears.
12. Click Finish to close the Add New E-mail Account dialog box.
13. Click Close to close the Account Settings dialog box.

Troubleshooting tips
If you still can’t send Yahoo! Mail from Outlook 2007, 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. Double-click your Yahoo! Mail Plus account. 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 OK to close the Internet E-mail Settings dialog box.
7. Click Next to continue. The Congratulations screen appears.
8. Click Finish to close the Change E-mail Account dialog box.
9. Click Close to close the Account Settings dialog box.

Sometimes various ISPs (Internet Service Providers) block port 25, which is the default port used by email providers like Yahoo configured on outlook. There is an easy way to fix this, and I will provide some pictures to illustrate it. There might be some slight differences depending on the version of outlook and/or outlook express you are using, if so let me know and I will clarify as I can.

1. From the "Tools" menu select "Accounts."
2. Select your Yahoo! POP account and click "Properties".
   
3. Click the "Advanced" tab. Under "Outgoing mail server (SMTP)," check the box next to "This server requires a secure connection (SSL)." (This step is not required if you choose to use port 587).

1. Enter port number 465 (recommended) or 587 in the "Outgoing mail (SMTP)" field.
   
2. Click "Apply," then "OK" and "Close."

Good Luck,

NOLA Tech

Incoming mail server settings

•POP server: plus.pop.mail.yahoo.com
•Use SSL
•Port: 995

Outgoing mail server (SMTP) settings

•SMTP server: plus.smtp.mail.yahoo.com
•Use SSL
•Port: 465
•Use authentication
•Account Name/Login Name: Your Yahoo! Mail ID (your email address without the "@yahoo.com", for example, “testing80”)
•Email Address: Your Yahoo! Mail address (for example, [email protected])
•Password: Your Yahoo! Mail password

Troubleshooting tips

If you still can’t send Yahoo! Mail from your mail program, you may be accessing the Internet through an ISP that is blocking the SMTP port. If this is the case, try setting the SMTP port number to 587 when sending email via Yahoo!'s SMTP server.

Your email program gives you the option of either deleting your Yahoo! messages from the Yahoo! server after downloading them into your mail reader, or leaving them on the Yahoo! server so you can see them online in your Yahoo! account, too.

Please make sure that you've entered your Yahoo! Mail address as the "From" address in your email client. You won't be able to send mail if you've entered another address.

If you have the Norton AntiVirus email feature enabled, you might have to do additional configuration to use Outlook or Outlook Express. For more information, please visit the Symantec web site.

If you've tried the above steps and continue to have problems, your ISP might not allow its users to send messages with other companies' SMTP outgoing mail servers.

If you're unable to send email, try using port 587 when sending via Yahoo!'s SMTP server. Here's how to make this change in Outlook:

1.From the "Tools" menu, select "Accounts."
2.Select your Yahoo! POP account and click the "Properties" button.
3.Click the "Advanced" tab.
4.Next to "Outgoing server (SMTP"), change port 25 to 587.
5.Click "Apply." Then click "OK" and "Close." Source(s): http://help.yahoo.com/l/us/yahoo/mail/ya…

Window Vista also have Outlook Express.. please enter the full info for your email account..

On the E-mail Settings page, enter your email account information as follows:

Your Name
Enter your first and last name.
E-mail Address
Enter your email address.
Account Type
Select POP3.
Incoming mail server
Type for your incoming mail server.
Outgoing mail server (SMTP)
Type for your outgoing mail server.
User Name
Enter your email address again.
Password
Enter the password you created for your email account.

After this please check for "Test Account setting"

If everything is working fine, then remove the previous account

And let us know the error message if come up any.

I hope it will resolve the problem and you will be able to use the Outlook.