Sergey Biryukov

Allows to receive e-mail messages in character sets different from the blog charset.
Based on the original plugin by Anton Skorobogatov, the founder of Russian WordPress community.

wp_mail Cyrillic

Allows to receive e-mail messages in character sets different from the blog charset.

HivePress

HivePress Messages is an extension for <a href="https://wordpress.org/plugins/hivepress/" rel="ugc">HivePress</a> plugin. It allows users to send private messages.
<a href="https://listinghive.hivepress.io/" rel="nofollow ugc">Demo</a> | <a href="https://help.hivepress.io/" rel="nofollow ugc">Docs</a> | <a href="https://community.hivepress.io/" rel="nofollow ugc">Support</a>

wp_mail Cyrillic vs HivePress Messages