Postbox is quite a useful mail client, which is based on Mozilla Thunderbird, so it looks so much like it, but according to the developers, they have more features. It should be noted right away that the client can be useful for those who usually write letters with attachments, such as photos or documents, videos, etc. You can send yourself photos directly from the client interface and then you can immediately upload them to the Picasa service. You can download Postbox below.

I would also like to point out the handy tab bar, there are a number of special buttons, for example, images, links and some others, which allow you to open all attachments in a letter with one click, you can also open all links by separate windows. Also, with each attachment in the letter, you can perform the sequence of actions that you need the most.

Postbox has its own search engine, you can instantly find the information you need in the letters that are sent to you, for example, the name of a contact person or their postal address, the link or the image you need, any piece of text. After the search is completed, the results can be viewed in a special form. Postbox is easy to use, Russian support is available, I really liked the interface, I have no complaints