Yes, Emails are leaking your IP address

Last edit: 03:34:11 8/19/2020

The article is not for technical discussion. This is neither complete nor professional. This is for reference only.

I was going through some emails I sent to myself. I became aware of the IP address leaking problem of which you can check out the sender’s IP, including the internet and local network, from the header of the email.

That’s why I started a little experiment. The email providers include Outlook, Gmail, iCloud, Yandex, QQ, 163. The platforms include Outlook APP, Thunderbird, iOS Mail APP, and the Web.

Here’s the result

iOS Mail APP

Email Provider	IP Address Leaking
163	√
QQ	√
iCloud	√
Outlook	√
Gmail	×
Yandex	×

Outlook APP

Email Provider	IP Address Leaking
163	×
QQ	-
iCloud	×
Outlook	×
Gmail	-
Yandex	×

They all came with Microsoft’s IP addresses.

Web

Email Provider	IP Address Leaking
163	√
QQ	√
iCloud	×
Outlook	×
Gmail	×
Yandex	×

Thunderbird

Email Provider	IP Address Leaking
163	√
QQ	-
iCloud	√
Outlook	√
Gmail	-
Yandex	-

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