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# Permissive E-mail Autolinks
With the flag `MD_FLAG_PERMISSIVEEMAILAUTOLINKS`, MD4C enables more permissive
recognition of e-mail addresses and transforms them to autolinks, even if they
do not exactly follow the syntax of autolink as specified in CommonMark
specification.
This is standard CommonMark e-mail autolink:
```````````````````````````````` example
E-mail: <mailto:[email protected]>
.
<p>E-mail: <a href="mailto:[email protected]">mailto:[email protected]</a></p>
````````````````````````````````
With the permissive autolinks enabled, this is sufficient:
```````````````````````````````` example
E-mail: [email protected]
.
<p>E-mail: <a href="mailto:[email protected]">[email protected]</a></p>
````````````````````````````````
`+` can occur before the `@`, but not after.
```````````````````````````````` example
hello@mail+xyz.example isn't valid, but [email protected] is.
.
<p>hello@mail+xyz.example isn't valid, but <a href="mailto:[email protected]">[email protected]</a> is.</p>
````````````````````````````````
`.`, `-`, and `_` can occur on both sides of the `@`, but only `.` may occur at
the end of the email address, in which case it will not be considered part of
the address:
```````````````````````````````` example
[email protected]
[email protected].
[email protected]
[email protected]_
.
<p><a href="mailto:[email protected]">[email protected]</a></p>
<p><a href="mailto:[email protected]">[email protected]</a>.</p>
<p>[email protected]</p>
<p>[email protected]_</p>
````````````````````````````````
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