[LES-1.3/st-compl] mailers-and-tools

Without coding. Example of basic mailers, tools.

Worth noting:
  - litmus.com tool.

core: B-4 / WL-AL

Author: matowdev

core-courses/4-web-layout-advanced-level/1-html-email-layout/1-3-mailers-and-tools/notes.md

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+# On the topic: "Html email layout"
+
+### Video-lesson:
+
+[1.3. Basic mailers and tools.](https://go.skillbox.ru/profession/profession-fullstack-js/weblayout-advanced/videolesson/c005745b-7ac8-4849-8f33-b5982b4e6dde)
+
+### A few words:
+
+Nowhere without checks..