No embedded images in html email from some mail server like mail.ru, rambler.ru etc

[supersuperoleg]

Environment

• Platform version: all
• Addon version: all

Description of the bug or enhancement

Embedded images in html emails sent from some email services are not displayed.
Problems are observed when sending emails from mail.ru (and all their boxes, such as @bk.ru etc), rambler.ru .
When sending emails, for example, from Yandex mail, everything is displayed normally.
This applies to all versions of the imap addon.

I checked the addon sources, found a problem in the getMultipartBody method of the class ImapHelper.java

the solution is published at the link above (https://forum.cuba-platform.com/t/html/17383)