由于 Gmail一直允许其用户通过POP 和 IMAP(POP and IMAP) 免费访问他们的电子邮件，雅虎(Yahoo)被迫也免费提供此功能，尽管直到很久以后。
通过POP 和 IMAP 访问(POP and IMAP access)，您可以从您喜欢的电子邮件客户端（如Outlook、Thunderbird、iOS邮件应用程序等）管理您的电子邮件(mail app)。POP 和 IMAP(POP and IMAP)之间的主要区别在于前者只允许单向同步，而后者可以做双向同步。
双向同步(Two-way sync)意味着如果您在Outlook 客户端(Outlook client)应用程序中删除电子邮件，它也会从电子邮件服务器中删除。使用POP，电子邮件将保留在您的服务器上，并且在其他设备上查看您的电子邮件时仍将保留。除非您有特定原因，否则应始终使用IMAP。
在本文中，我将引导您完成使用Outlook作为电子邮件客户端(email client)设置带有POP3 或 IMAP的(POP3 or IMAP)Yahoo Mail的步骤。如果您有不同的电子邮件客户端(email client)，选项将完全相同，只是在不同的位置。
在 Outlook 中设置雅虎邮箱
请注意，所有Yahoo 电子邮件(Yahoo email)帐户都可以使用IMAP 或 POP 访问(IMAP or POP access)，而无需对您的帐户进行任何更改。在Gmail中，您必须专门进入并启用POP 或 IMAP(POP or IMAP)才能正常工作。使用Yahoo时，它一直处于启用状态，这在安全性方面可能不是一件好事，但我们对此无能为力。
现在打开 Outlook，单击文件(File)，然后单击添加帐户( Add Account)按钮。
在下一个屏幕上，不要试图点击电子邮件帐户( Email Account)，因为我已经尝试过了，但它不起作用。对于Yahoo，您必须手动输入所有设置，这很麻烦，因此请单击Manual setup or Additional server types。
接下来，您要单击POP 或 IMAP(POP or IMAP)选项，然后单击Next。
下一个屏幕是该过程中最重要的部分。在这里，我们必须手动输入您的Yahoo Mail 帐户的所有(Yahoo Mail account)服务器和登录信息(server and login information)。
首先，输入您的姓名和完整的Yahoo 电子邮件(Yahoo email)地址。接下来，为Account Type选择(Account Type)IMAP。现在复制并粘贴(copy and paste)相应字段的以下值：
Incoming mail server - imap.mail.yahoo.com
Outgoing mail server - smtp.mail.yahoo.com
在登录信息(Logon Information)下，确保使用完整的电子邮件地址(email address)并输入密码。请注意，如果您在 Yahoo Mail 帐户(Mail account)上启用了双因素，则需要生成应用程序密码(app password)，而不是使用普通的Yahoo 密码(Yahoo password)。
接下来，选中需要使用安全密码验证 (SPA) 登录(Require logon using Secure Password Authentication (SPA))框，然后单击更多设置(More Settings)按钮。
在这里，我们必须进行一些更改。首先(First)，点击Outgoing Server并确保我的发送服务器 (SMTP) require authentication(My outgoing server (SMTP) require authentication)复选框被选中。然后单击高级(Advanced)选项卡。
这里我们必须将IMAP端口更改为993并将SMTP端口更改为465或587，您可以选择。接下来(Next)，您需要为传入和传出(incoming and outgoing)的加密连接类型选择SSL。单击(Click)确定(OK)，然后Outlook应自动启动电子邮件测试。
它将尝试登录您的电子邮件服务器(email server)，然后发送测试电子邮件(test email message)。如果一切配置正确，您应该会看到一些绿色复选标记。如果没有，请返回并确保您正确输入了所有内容，包括您的密码。
如果您确定要使用POP3而不是IMAP，您只需更改一些设置。在主屏幕上，为传入和传出邮件服务器(mail server)使用以下值：
Incoming mail server - pop.mail.yahoo.com
Outgoing mail server - smtp.mail.yahoo.com
在更多设置(More Settings)选项下，您需要使用端口995来接收邮件服务器(mail server)，但仍然可以使用465或587来发送邮件。
您还需要选中This server requires an encrypted connection (SSL)框，然后从Outgoing server下的下拉列表中选择SSL。另外，您需要转到“传出服务器( Outgoing Server)”选项卡并选中“我的传出服务器需要身份验证( My outgoing server requires authentication)”框。
电子邮件测试后，您会看到一个确认窗口(confirmation window)，显示您已准备就绪。
现在单击 Send/Receive选项卡，然后单击Send/Receive All Folders按钮。您的所有电子邮件都应该开始加载到Outlook中。
这就是它的全部内容！如果您使用IMAP ，您现在应该能够在您想要的电子邮件客户端上访问您的Yahoo Mail ，并将其同步到您的所有设备。如果您有任何问题，请随时发表评论。享受！
How to Access Yahoo! Mail using POP3 or IMAP
Since Gmail has always allowed іts users to access their email via POP and IMAP for free, Yahoo was forced to also provide this feature for free, аlthough it wasn’t until much later.
With POP and IMAP access, you can manage your email from your favorite email client like Outlook, Thunderbird, the iOS mail app, etc. The main difference between POP and IMAP is that the former only allows for one-way sync and the latter can do two-way sync.
Two-way sync means that if you delete an email in the Outlook client app, it will also be deleted from the email servers. With POP, the email would remain on your server and would still remain when viewing your email on other devices. Unless you have a specific reason, you should always use IMAP.
In this article, I’ll walk you through the steps for setting up Yahoo Mail with POP3 or IMAP using Outlook as the email client. If you have a different email client, the options will be exactly the same, just in different locations.
Setup Yahoo Mail in Outlook
Note that all Yahoo email accounts are eligible for IMAP or POP access without having to make any changes to your account. In Gmail, you have to specifically go in and enable POP or IMAP before it will work. With Yahoo, it’s just enabled all the time, which probably isn’t a good thing in terms of security, but there’s not much we can do about that.
Now open Outlook, click on File and then click on the Add Account button.
On the next screen, don’t be tempted to click on Email Account because I already tried that and it doesn’t work. For Yahoo, you have to manually enter all the settings, which is a pain, so click on Manual setup or additional server types.
Next you want to click on the POP or IMAP option and click Next.
The next screen is the most important part of the process. Here we have to manually enter all of the server and login information for your Yahoo Mail account.
First, enter your name and your full Yahoo email address. Next, choose IMAP for Account Type. Now copy and paste the following values for the appropriate fields:
Incoming mail server - imap.mail.yahoo.com
Outgoing mail server - smtp.mail.yahoo.com
Under Logon Information, make sure you use your full email address and enter your password. Note that if you have two-factor enabled on your Yahoo Mail account, you’ll need to generate an app password instead of using your normal Yahoo password.
Next, check the Require logon using Secure Password Authentication (SPA) box and then click on the More Settings button.
Here, we have to make a couple of changes. First, click on Outgoing Server and make sure the My outgoing server (SMTP) require authentication box is checked. Then click on the Advanced tab.
Here we have to change the IMAP port to 993 and the SMTP port to 465 or 587, you can pick. Next, you need to choose SSL for the type of encrypted connection for both incoming and outgoing. Click OK and then Outlook should automatically start an email test.
It will try to log into your email server and then send a test email message. If everything is configured correctly, you should see some green checkmarks. If not, go back and make sure you typed in everything correctly, including your password.
If you are certain you want to use POP3 instead of IMAP, you simply have to change a few of the settings. On the main screen, use the following values for incoming and outgoing mail server:
Incoming mail server - pop.mail.yahoo.com
Outgoing mail server - smtp.mail.yahoo.com
Under the More Settings options, you need to use port 995 for incoming mail server, but still can use 465 or 587 for outgoing.
You also need to check the This server requires an encrypted connection (SSL) box and choose SSL from the drop down under Outgoing server. Plus, you need to go to the Outgoing Server tab and check that same My outgoing server requires authentication box.
After the email test, you’ll see a confirmation window showing that you’re all set to go.
Now click on the Send/Receive tab and click the Send/Receive All Folders button. All of your email should start to load into Outlook.
That’s about all there is to it! You should now be able to access your Yahoo Mail on your desired email client and have it synced to all of your devices if you use IMAP. If you have any questions, feel free to comment. Enjoy!
