Sitecore EXM broken link in the mail message

Question

I've created "Simple HTML message" and added some internal links in the Message body using rich text editor

In html it look like this:

<a href="~/link.aspx?_id=D16025CAB7D049FDAC6863C29C13F0C1&amp;_z=z">TEST</a>

When I sending test message this link is converted to: http:mydomain.com/://mydomain.com/TEST

This link is broken, redundant part - ://mydomain.com/

How I can fix it?

LinkManager.config

<add name="sitecore" type="Sitecore.Links.LinkProvider, Sitecore.Kernel" addAspxExtension="false" alwaysIncludeServerUrl="false" encodeNames="true" languageEmbedding="never" languageLocation="filePath" lowercaseUrls="false" shortenUrls="true" useDisplayName="true" siteResolving="true" patch:source="LinkManager.config"/>

Sites.config:

<site name="Website3" targetHostName="site1.mydomain.com" hostName="site1.mydomain.com" virtualFolder="/" physicalFolder="/" rootPath="/sitecore/content/site1.mydomain.com" startItem="/home" language="en" database="web" domain="extranet" allowDebug="true" cacheHtml="true" htmlCacheSize="10MB" registryCacheSize="0" viewStateCacheSize="0" xslCacheSize="25MB" filteredItemsCacheSize="10MB" enablePreview="true" enableWebEdit="true" enableDebugger="true" disableClientData="false" cacheRenderingParameters="true" renderingParametersCacheSize="10MB" patch:source="Sites.config"/>
<site name="Website2" targetHostName="site2.mydomain.com" hostName="site2.mydomain.com" virtualFolder="/" physicalFolder="/" rootPath="/sitecore/content/site2.mydomain.com" startItem="/home" language="en" database="web" domain="extranet" allowDebug="true" cacheHtml="true" htmlCacheSize="10MB" registryCacheSize="0" viewStateCacheSize="0" xslCacheSize="25MB" filteredItemsCacheSize="10MB" enablePreview="true" enableWebEdit="true" enableDebugger="true" disableClientData="false" cacheRenderingParameters="true" renderingParametersCacheSize="10MB" patch:source="Sites.config"/>
<site name="Website1" targetHostName="mydomain.com" virtualFolder="/" physicalFolder="/" rootPath="/sitecore/content/www.mydomain.com" startItem="/home" language="en" database="web" domain="extranet" allowDebug="true" cacheHtml="true" htmlCacheSize="50MB" registryCacheSize="0" viewStateCacheSize="0" xslCacheSize="25MB" filteredItemsCacheSize="10MB" enablePreview="true" enableWebEdit="true" enableDebugger="true" disableClientData="false" cacheRenderingParameters="true" renderingParametersCacheSize="10MB" patch:source="Sites.config"/>