Email not working after connecting Fortinet forticlient VPN

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Level 1

10 points

Email not working after connecting Fortinet forticlient VPN

We are using Fortinet FortiClient VPN for connecting with our company network.

After successfully connecting with FortiClient VPN on iPhone, when we check email it is not working. However, authentication with email server is complete, but we are unable to send and receive emails.

Other things accessibility while connecting with FortiClient VPN are working fine.

Help and guidance requested as our iPhone users are badly affected while the same is working smoothly of Android devices.

Note: We experienced this issue after upgrade to new iOS version 18. Previously, email was working fine while connecting with FortiClient VPN on previous version.

Additionally, as a security feature and as per policy when we are connected with Fortinet FortiClient VPN, internet services on the device will not work as split tunneling is disabled.

We have also checked that ports are not blocking at our company network end.

Thanks.

Posted on Aug 8, 2025 03:55 AM

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Answer 1

Aug 8, 2025 02:04 PM in response to MAK025

If you are the employer, who requires your employees to use this VPN Client to access your email servers, this is a public, user to user only forum. It's highly doubtful any of us users can help you. You should contact Fortinet for help with their VPN client. For the rest of users who are not required to use a VPN on their iPhone, we tell users to NOT use one as they almost always cause connectivity issues, like you're seeing right now.

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Answer 2

MAK025 Author

Level 1

10 points

Aug 8, 2025 10:18 PM in response to lobsterghost1

Thanks for the response. We have already contacted Fortinet for issue and their VPN client is working absolutely fine. And email over Fortinet VPN client on Android phone is working properly.

Additionally, i figured out that apart from company emails access via VPN, we are also not getting any emails for GMAIL account configured in iPhone MAIL app. However, the same GMAIL email is working perfectly fine on browser.

One more thing I have observed that emails are being fetched but are not displaying on the iPhone MAIL app. Seems like some BUG on iPhone MAIL app. I have used versions 18.5 and 18.6.

Hoping to get a solution for this.

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Answer 3

MAK025 Author

Level 1

10 points

Aug 8, 2025 10:19 PM in response to KiltedTim

Thanks for the response. We have already contacted Fortinet for issue and their VPN client is working absolutely fine. And email over Fortinet VPN client on Android phone is working properly.

Additionally, i figured out that apart from company emails access via VPN, we are also not getting any emails for GMAIL account configured in iPhone MAIL app. However, the same GMAIL email is working perfectly fine on browser.

One more thing I have observed that emails are being fetched but are not displaying on the iPhone MAIL app. Seems like some BUG on iPhone MAIL app. I have used versions 18.5 and 18.6.

Hoping to get a solution for this.

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Answer 4

Aug 9, 2025 06:47 AM in response to MAK025

MAK025 wrote:

Thanks for the response. We have already contacted Fortinet for issue and their VPN client is working absolutely fine. And email over Fortinet VPN client on Android phone is working properly.

Additionally, i figured out that apart from company emails access via VPN, we are also not getting any emails for GMAIL account configured in iPhone MAIL app. However, the same GMAIL email is working perfectly fine on browser.

One more thing I have observed that emails are being fetched but are not displaying on the iPhone MAIL app. Seems like some BUG on iPhone MAIL app. I have used versions 18.5 and 18.6.

Hoping to get a solution for this.

You won't get a solution here. This is a user to user only forum, NOT Apple Support. And as users, we don't recommend VPNs to our fellow users as they cause connectivity issues with iPhone. If you aren't with the IT department of your company, it's your IT people you need to turn to.

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Answer 5

MAK025 Author

Level 1

10 points

Aug 11, 2025 10:00 AM in response to lobsterghost1

Thanks for the advice. However, my query to community users is not for any issues with the VPN.

It pertains to iPhone MAIL app which is not showing emails after upgrade to 18.5 and 18.6. However, the same email is working on browser. Hoping it clarifies.

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Answer 6

Aug 11, 2025 11:14 AM in response to MAK025

MAK025 wrote:

Let me resubmit my query with the information related to email issue.

Thanks KiltedTim and lobsterghost1 for response.

Requesting community team to close this thread.

You're welcome. But the thread won't be closed. It may actually help someone else who comes along and wonders why their having connectivity issues using the VPN client you're using.

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