Product Images Does not Shown in Mail

Hi,
I was test and worked when I install and setup the plugin on my website but just realized that the product images does not shown on the emails which send to shop manager and customers too. I’m using Yandex as a mail provider and checking my mails directly Yandex’s website (I dont use any mail client) but I just checked on outlook (I sent a test email to admin’s email).
My logo on header does not appear, the images of the products does not appeared. When I “Allow to download images” link then my logo appeared but product’s imaged did not.

And one more thing, I’m using default icon on your template and that icon always appear on Yandex mail or outlook cleint.

P.S:
– All our product’s images are jpeg format
– I’m using latest version of the plugin (1.2.16)