您是否因为(Are)邮件(Mail)应用程序不断显示“无法验证服务器身份”错误而无法在 iPhone 或 iPad 上发送或接收电子邮件？这很可能是因为Mail应用程序无法安全地与电子邮件提供商的服务器(email provider’s server)通信。例如，如果电子邮件提供商的安全套接字层 (SSL) 证书(Secure Socket Layer (SSL) certificate)已过期或不受信任，您将收到此错误。
软件错误、网络连接不良、服务器停机和临时系统故障等其他因素也可能触发邮件(Mail)应用程序显示此错误。我们将向您展示一些解决方案，为遇到问题的用户修复错误。同样(Likewise)，我们还将列出我们从个人实验中发现的其他有效解决方案。
首先(First)，确保你有一个活跃的互联网连接。打开您的网络浏览器并检查您是否可以访问任何网页。这将帮助您确定您的互联网是否正常工作。如果您的连接不是问题，下面列出的解决方案之一应该可以发挥作用。
关闭并重新打开邮件应用程序
(Swipe)从屏幕底部向上滑动以打开 iOS App Switcher。对于带有物理主页按钮的 iPhone 和 iPad，双击主页(Home)按钮将显示App Switcher。之后(Afterward)，向上滑动邮件(Mail)应用程序，直到它从屏幕上消失。
如果重新打开邮件(Mail)应用程序时仍然弹出错误，请尝试以下故障排除解决方案。
切换到蜂窝连接
根据此 Apple 讨论线程中的一些 iPhone 用户的说法，该错误消息仅在通过(iPhone users in this Apple Discussion thread)Wi-Fi访问邮件时才会弹出。令人惊讶(Surprisingly)的是，切换到蜂窝或移动数据解决了这个问题。如果您在Wi-Fi(Wi-Fi)连接上不断收到“无法验证服务器身份”错误，请切换到蜂窝数据并重新打开邮件(Mail)应用程序。
重启你的 iPhone 或 iPad
重新启动您的设备可以修复阻止邮件(Mail)应用程序验证或识别电子邮件服务器的临时故障。
前往“设置”(Settings) > “通用(General)” > “关机(Shut Down)”，然后将“滑动关机”滑块向右移动。
等待(Wait)大约 10-20 秒，让您的设备关闭。之后(Afterward)，按住侧面按钮重新开机。然后，启用蜂窝数据或加入 Wi-Fi 网络，启动邮件(Mail)应用程序并检查您是否能够发送和接收电子邮件而没有任何错误消息。
检查电子邮件提供商状态
如果电子邮件客户端服务器出现停机，邮件(Mail)应用程序可能无法验证帐户的身份。使用DownDetector(DownDetector)等第三方中断监控工具来确认您的电子邮件提供商服务器的状态。
例如，如果受影响的电子邮件是Gmail帐户，请访问DownDetector并在搜索栏中输入“gmail”。在搜索栏中键入“outlook”或“yahoo mail”将显示Outlook和Yahoo!的服务器状态。邮件(Mail)，分别。
如果DownDetector报告服务器端停机时间，您必须等到您的电子邮件服务提供商解决问题。否则，请尝试以下其他故障排除解决方案。
禁用安全套接层(Secure Socket Layer)( SSL ) 加密
一些 iPhone 和 iPad 用户通过关闭电子邮件帐户的安全套接字层(Secure Socket Layer)( SSL ) 加密，成功解决了“无法验证服务器身份”错误。尝试一下，看看它是否会在您的设备上产生所需的结果。
- 打开设置应用程序并选择邮件(Mail)。
- 选择帐户(Accounts)。
- 在“帐户(Accounts)”部分中，选择受影响的电子邮件帐户。
- 再次选择帐户以继续。
- 选择高级(Advanced)。
- 在“传入设置”部分中，关闭“使用 SSL(Use SSL) ”选项。
这将为该特定地址的传入电子邮件禁用SSL加密。(SSL)尽管此故障排除技巧可能有助于解决问题，但值得一提的是，禁用此选项会降低传入电子邮件的安全性。
禁用和重新启用帐户
暂时禁用有问题的帐户可能会触发邮件(Mail)帐户来验证电子邮件客户端的服务器。此操作只会从邮件(Mail)应用程序中删除电子邮件帐户，而不是从您的设备中删除。这是您需要做的：
- 打开设置应用程序，导航到邮件(Mail)>帐户(Accounts)并选择受影响的帐户。
- 关闭邮件(Mail)选项。
- 等待(Wait)大约 10 秒钟，然后重新打开“邮件”(Mail)选项。
这将提示邮件(Mail)应用程序从头开始同步和重新验证电子邮件地址。如果问题仍然存在，请删除电子邮件帐户(delete the email account)（请参阅下一节中的步骤）并从头开始重新连接。
删除并重新添加电子邮件帐户
当您从Mail应用程序中删除有问题的帐户时，它也会从您的 iPhone 或 iPad 中删除该帐户。这种故障排除技术解决了一些 iPad 用户(some iPad users)的问题。以下是在 iPhone 或 iPad 上删除帐户的方法：
- 打开邮件设置菜单（设置(Settings)>邮件(Mail)>帐户(Accounts)）并选择有问题的帐户。
- 选择删除帐户(Delete Account)。
您将收到警告提示，通知您删除帐户将删除与该帐户关联的日历、联系人和其他数据。
- 选择从我的 iPhone 中删除(Delete from My iPhone)以继续。
- 返回 iOS帐户(Accounts)设置菜单并选择添加帐户(Add Account)。
- 选择帐户的客户/提供商。
- 输入您的帐户凭据以登录。
升级或更新 iOS
如果您很长时间没有安装 iOS 更新，“无法验证服务器身份”错误可能是由于您的 iOS 版本或邮件(Mail)应用程序中的错误造成的。
将您的 iPhone 或 iPad 连接到 Wi-Fi 网络，前往“设置”(Settings) > “通用(General)” > “软件更新”(Software Update)，然后轻点“下载并安装(Download and Install)” 。
安装操作系统更新将同时在您的设备上安装最新版本的邮件(Mail)应用程序。
相反，如果您在安装 Beta iOS 版本(installing a Beta iOS build)或不稳定的 iOS 升级后发现此错误，请考虑降级您的 iPhone。请参阅有关回滚 iOS 更新的指南(guide on rolling back an iOS update)，了解如何正确降级您的 iPhone。
享受无错误的电子邮件体验
虽然我们确信这些建议中的至少一项可以阻止错误消息，但如果问题仍然存在，您应该联系您的电子邮件服务提供商。
您也可以尝试重置您的 iPhone 网络设置（转到设置(Settings)>通用(General)>重置(Reset)>重置网络设置(Reset Network Settings)）。这将解决任何中断邮件(Mail)应用程序和电子邮件客户端服务器之间握手的网络相关问题。
How to Fix a “Cannot Verify Server Identity” Error on iPhone or iPad
Are you unable to send or receive emails on your iPhone or iPad because the Mail app keeрs diѕplaying a “Cannot Verify Ѕerver Idеntity” error? That’s mоst likely because the Mail app cannot sеcυrely communicate with the email provider’s server. For example, you’ll get this error if the email provider’s Secure Socket Layer (SSL) certificate is expired or untrusted.
Other factors like software bugs, poor network connection, server downtime, and temporary system glitches can also trigger the Mail app to display this error. We’ll show you some solutions that fixed the error for users who experienced the issues. Likewise, we’ll also list other effective solutions that we discovered from personal experimentation.
First things first, ensure you have an active internet connection. Open your web browser and check if you can access any webpage. That’ll help you determine whether or not your internet is working correctly. If your connection isn’t the problem, one of the solutions listed below should work the magic.
Close and Reopen the Mail App
Swipe up from the bottom of your screen to open the iOS App Switcher. For iPhones and iPads with a physical home button, double-clicking the Home button will reveal the App Switcher. Afterward, swipe up the Mail app until it disappears from the screen.
Try the following troubleshooting solutions if the error still pops up when you reopen the Mail app.
Switch to Cellular Connectivity
According to some iPhone users in this Apple Discussion thread, the error message only pops up when accessing mail via Wi-Fi. Surprisingly, switching to cellular or mobile data resolved the problem. If you keep getting the “Cannot Verify Server Identity” error on a Wi-Fi connection, switch to cellular data and reopen the Mail app.
Restart Your iPhone or iPad
Restarting your device can fix temporary glitches preventing the Mail app from verifying or identifying the email server.
Go to Settings > General > Shut Down and move the “slide to power off” slider to the right.
Wait for about 10-20 seconds for your device to shut down. Afterward, hold the side button to power it back on. Then, enable cellular data or join a Wi-Fi network, launch the Mail app and check if you’re able to send and receive emails without any error message.
Check Email Provider Status
The Mail app might fail to verify the account’s identity if the email client servers are experiencing downtime. Use third-party outage monitoring tools like DownDetector to confirm the status of your email provider’s servers.
For instance, if the affected email is a Gmail account, visit DownDetector and type “gmail” in the search bar. Typing “outlook” or “yahoo mail” in the search bar will display the server status for Outlook and Yahoo! Mail, respectively.
If DownDetector reports server-side downtime, you’d have to wait until your email service provider resolves the problem. Otherwise, try other troubleshooting solutions below.
Disable Secure Socket Layer (SSL) Encryption
Some iPhone and iPad users successfully resolved the “cannot verify server identity” error by turning off Secure Socket Layer (SSL) encryption for the email account. Try that and see if it yields the desired result on your device.
- Open the Settings app and select Mail.
- Select Accounts.
- In the Accounts section, select the affected email account.
- Select the account again to proceed.
- Select Advanced.
- In the “Incoming Settings” section, toggle off the Use SSL option.
That’ll disable SSL encryption for incoming emails for that particular address. Although this troubleshooting trick might help fix the problem, it’s worth mentioning that disabling this option makes incoming emails less secure.
Disable and Re-Enable the Account
Temporarily disabling the problematic account could trigger the Mail account to verify the email client’s server. This operation will only remove the email account from the Mail app, not from your device. Here’s what you need to do:
- Open the Settings app, navigate to Mail > Accounts and select the affected account.
- Toggle off the Mail option.
- Wait for about 10 seconds and toggle the Mail option back on.
That’ll prompt the Mail app to synchronize and reverify the email address from scratch. If the problem persists, delete the email account (see steps in the next section) and reconnect it from scratch.
Delete and Re-Add Email Account
When you remove the problematic account from the Mail app, it will also delete the account from your iPhone or iPad. This troubleshooting technique fixed the problem for some iPad users. Here’s how to delete an account on your iPhone or iPad:
- Open the Mail settings menu (Settings > Mail > Accounts) and select the problematic account.
- Select Delete Account.
You’ll get a warning prompt notifying you that deleting the account will remove the calendars, contacts, and other data associated with the account.
- Select Delete from My iPhone to proceed.
- Return to the iOS Accounts settings menu and select Add Account.
- Select the account’s client/provider.
- Enter your account’s credentials to sign in.
Upgrade or Update iOS
If you haven’t installed an iOS update in a long time, the “Cannot Verify Server Identity” error is probably due to a bug in your iOS build or within the Mail app.
Connect your iPhone or iPad to a Wi-Fi network, go to Settings > General > Software Update, and tap Download and Install.
Installing an OS update will simultaneously install the latest version of the Mail app on your device.
Conversely, if you noticed this error after installing a Beta iOS build or an unstable iOS upgrade, consider downgrading your iPhone. Refer to this guide on rolling back an iOS update to learn how to downgrade your iPhone correctly.
Enjoy an Error-Free Emailing Experience
While we’re confident that at least one of these recommendations will stop the error message, you should contact your email service provider if the problem persists.
You could also try resetting your iPhone network settings (go to Settings > General > Reset > Reset Network Settings). That’ll squash any network-related issue interrupting the handshake between the Mail app and your email client’s server.
