Outlook is unable to connect to the Outgoing (SMTP) email server when I am connected at home. I do not have this problem from any other internet connection.

Hi there,

Please follow steps below to setup your Gmail to work with Outlook:

Before you can configure Outlook to work with Gmail, you must configure Gmail to work with Outlook. To do that, you must enable the IMAP protocol for your Gmail account. Here are the steps:

1. Log into your Gmail account.
2. Click the gear icon at the top right, then choose Settings.
3. Click Forwarding and POP/IMAP to bring up the POP and IMAP settings.
4. Click Enable IMAP.
5. Click Save Changes.

After you configure Gmail for IMAP, you can add your Gmail account to Outlook. Here are the steps for Microsoft Outlook:

1. Start Outlook.
2. Choose File > Account Settings.
3. In the Account Settings dialog box, click New.
4. Choose Email Account, then click Next.
5. Choose Manual Setup or Additional Server Types, then click Next.
6. Choose Pop or IMAP, then click Next.
7. In the Add Account page, enter the following information:

Your name: The display name you'd like to use
Email address: Your complete Gmail address (ex: [email protected])
Account type: IMAP
Incoming mail server: imap.Gmail.com
Outgoing mail server (SMTP): smtp.Gmail.com
User name: Your complete Gmail address (ex: [email protected])
Password: Your Gmail Password
8. Click More Settings. 9. Click the Outgoing Server tab.
10. Select My Outgoing Server (SMTP) requires authentication.
11. Select Use Same Settings As My Incoming Mail Server
12. Click the Advanced tab.
13. Enter the following information:
Incoming server (IMAP): 993
Use the following type of encrypted connection: SSL
Outgoing server (SMTP): 465
Use the following type of encrypted connection: SSL
14. Click OK to close the More Settings dialog box.
15. Click Next.
16. Be patient while Outlook tests the connection.
17. When the test completes, click Close. (If the test is not successful, carefully double-check all of your entries.)
18. Click Finish.

Hi,

If you are not connected to the internet, you can only work offline, and for example, if you write an email it will not send until you do connect to the internet.

You can configure Outlook 2007 to work with Yahoo.

If you want to "POP" your Yahoo! Mail into your Outlook 2007 application, here's how:

1. From the Tools menu, select "Account Settings." 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 Email tab, click New.
3. Check the box next to the first option, "Microsoft Exchange, POP3, IMAP, or HTTP" and click Next.
4. In the Your Name box, type your name as you'd like it to appear when you send a message.
5. In the Email Address box, enter your Yahoo! Mail address (for example, "[email protected]").
6. Check the box for "Manually configure server settings or additional server types" and click Next.
7. Check the box next to the first option "Internet E-mail" and click Next.
8. In the Server Information area, under "Account Type" select POP 3 from the pull-down menu.
9. In the Incoming mail server field, enter: pop.mail.yahoo.com.sg
10. In the Outgoing mail server (SMTP) field, enter: smtp.mail.yahoo.com.sg
11. In the Login Information area, in the User Name field, enter your Yahoo! ID (your email address without the "@yahoo.com").
12. In the Password box, enter your Yahoo! Mail password.
13. Check "Remember Password" if you don't want Outlook to prompt you for your password each time you check your mail. Handy!
14. Do not check the box labeled "Log on using Secure Password Authentication (SPA)."
15. Click on the More Settings button.
16. Click on the Outgoing Server tab and check the box next to "My outgoing server (SMTP) requires authentication."
17. Click on the Advanced tab.
18. Under "Incoming Server (POP3)", check the box next to "This server requires an encrypted connection (SSL)". The port number in the "Incoming Server (POP3)" field should automatically change from 110 to 995. If it doesn't, make sure the port number is set to 995.
19. Under "Outgoing Server (SMTP)", check the box next to "This server requires an encrypted connection (SSL)". Enter port number "465" in the "Outgoing Server (SMTP)" field.
20. If you'd like to keep a copy of your email messages on the Yahoo! Mail server, check the box next to "Leave a copy of messages on the server." If you want to delete your messages from the Yahoo! Mail server after viewing them in Outlook, don't check the box.
21. Click the OK button.
22. Click the Next button on the Email Account Wizard, then click Finished.
23. Would you like your Yahoo! Mail inbox to be your primary inbox in Outlook 7? If so, click the Tools menu and select "Account Settings." If you don't see "Account Settings," place your cursor over the two arrows at the bottom of the list to display more choices.
24. From the list, select the pop.yahoo account you've just added and click the Set as Default button.
25. Click the Close button. You're done!

Troubleshooting instructions
If you followed the above configuration steps, you should be all set. However, if you cannot send or receive mail with your email client, try the following tips.
The Yahoo! Mail SMTP server requires authentication. Make sure you have enabled SMTP authentication. To turn this setting on, follow these steps:

1. From the Tools menu, choose "Account Settings."
2. Select the "E-mail" tab.
3. Select your Yahoo! Mail account and click Change.
4. Click on the "Outgoing Server" tab.
5. Check the box next to "My Server Requires Authentication."
6. Please make sure that "Log on using" is not checked.
7. Click OK.

To control deletion of messages from the Yahoo! Mail server:

1. From the Tools menu, select "Account Settings."
2. Click on the "Email" tab.
3. Select your Yahoo! Mail account and click Change.
4. Click on the "Advanced" tab.
5. Check "Leave a copy of messages on server" if you want to save your Yahoo! Mail messages on the Yahoo! Mail server as well as on your local computer. Please note that setting your email client to remove messages from the server will cause your messages to be deleted from the server. Once the messages are deleted, we are unable to retrieve them.
6. Click OK.
7. Close Microsoft Outlook and restart.

We strongly recommend that you enable SSL for both POP and SMTP, as detailed in the above instructions. This will ensure that your Yahoo! ID, password and email messages are transmitted securely between your mail client and the Yahoo! servers. However, if you choose to not use SSL for SMTP, your email client will likely default the SMTP port to 25. If your ISP blocks port 25 or if you're unable to send email, then you will need to use port 587 when sending via Yahoo!'s SMTP server. To make this change, please follow the directions below:

1. From the "Tools" menu, select "Account Settings"
2. Select your Yahoo! POP account and click on Change.
3. Click on the "Advanced" tab.
4. Click OK and Close.

Hello,
Please check your outgoing server's settings in Outlook:
It should be "smtp.mail.yahoo.com"
Check the box "the server requires authentication"
Under "Outgoing mail Server (SMTP)", check the box next to "This server requires a secure connection (SSL). Enter port number "465" in the "Outgoing mail (SMTP)" field.
Hope that helps

You probaly have the SSL box checked in your SMTP settings.

Open Outlook Express.
Click on Tools in the menu, and click on Accounts in the drop-down menu.
Click on Mail.
Double-click mail account.
Click on Advanced.
Outgoing mail (SMTP) should be 25
Box on the left of This server requires secure connection (SSL) should be clear. If not, click on it to clear the check.
Clikc OK button and you should now be able to send emails.

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.

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Hello
try this:
go to your Internet Service Provider's web site and search for the email settings for their email servers.
or phone them and the should walk you through setting up your Outlook.
It is different for every service provider so I'm sorry I can't give you the exact settings.

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.

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…

What are the incoming pop3 & outgoing SMTP settings.they should be pop.sbcglobal.yahoo.com & smtp.sbcglobal.yahoo.com
Please check

Which antivirus are you using?