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https://github.com/vmg/redcarpet/issues/402
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The latest version of Redcarpet still have this problem (we upgraded Redcarpet to 3.4.0 in r16583).
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kay rus wrote:
> https://github.com/vmg/redcarpet/issues/402

Go MAEDA wrote:
> The latest version of Redcarpet still have this problem (we upgraded Redcarpet to 3.4.0 in r16583).

Redmine is not affected by the respective issue because we have @no_intra_emphasis: true@ and the emails with _ are recognised correctly. Please see the below screenshot.

The issue with @<a_bc@def.com>@ looks to be from the same Redcarpet gem, the text is filtered out because it is recognised wrongly as HTML tag.

!markdown_emails.png!

Rails console:

With @:filter_html => true@:
<pre>
irb(main):012:0> Redcarpet::Markdown.new(Redmine::WikiFormatting::Markdown::HTML.new(:filter_html => true, :hard_wrap => true), autolink: true, no_intra_emphasis: true).render("<a_bc@def.com>")
=> ""
</pre>

With @:filter_html => false@:
<pre>
irb(main):013:0> Redcarpet::Markdown.new(Redmine::WikiFormatting::Markdown::HTML.new(:filter_html => false, :hard_wrap => true), autolink: true, no_intra_emphasis: true).render("<a_bc@def.com>")
=> "<p><a_bc@def.com></p>\n"
</pre>
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