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Plugin automatically fills the ALT attribute in HTML IMG tag on every insert a new image into the post, if it is not full.
Note 1. “AFI” does not attribute alt attribute to the images added to the media library.
Note 2. On the role of ALT attribute for the search engines read here:
<ul>
<li>http://help.yandex.com/images/?id=1112581</li>
<li>http://support.google.com/webmasters/bin/answer.py?hl=en&answer=114016</li>
</ul>

ALT for images

Automatic insertion of alt attribute header-based embedded image.

Janis Elsts

Align RSS Images is a simple plugin that scans your RSS feed and ensures that every image has the correct alignment and margin settings. This is useful if you want the images to appear correctly aligned not just on your site, but also in your RSS feed.
Technically speaking, the plugin finds HTML elements styled with any of the WordPress-generated classes and appends an appropriate style attribute to each element. This is done dynamically when the feed is generated, so your actual posts won’t be modified.
Note: RSS readers that don’t support inline CSS will usually ignore alignment settings.

Align RSS Images

Scans your RSS feed and ensures that every image has the correct alignment and margin settings.

ALT for images vs Align RSS Images