diff --git a/bleach/linkifier.py b/bleach/linkifier.py
index 68a4042..df56f3c 100644
--- a/bleach/linkifier.py
+++ b/bleach/linkifier.py
@@ -1,5 +1,7 @@
 import re
 
+from urllib.parse import quote
+
 from bleach import callbacks as linkify_callbacks
 from bleach import html5lib_shim
 
@@ -298,10 +300,15 @@ class LinkifyFilter(html5lib_shim.Filter):
                             {"type": "Characters", "data": text[end : match.start()]}
                         )
 
+                    # URL-encode the "local-part" according to RFC6068
+                    parts = match.group(0).split("@")
+                    parts[0] = quote(parts[0])
+                    address = "@".join(parts)
+
                     # Run attributes through the callbacks to see what we
                     # should do with this match
                     attrs = {
-                        (None, "href"): "mailto:%s" % match.group(0),
+                        (None, "href"): "mailto:%s" % address,
                         "_text": match.group(0),
                     }
                     attrs = self.apply_callbacks(attrs, True)

diff --git a/tests/test_linkify.py b/tests/test_linkify.py
index 69181ca..fbabf12 100644
--- a/tests/test_linkify.py
+++ b/tests/test_linkify.py
@@ -104,6 +104,17 @@ def test_mangle_text():
         ),
         # Incorrect email
         ('"\\\n"@opa.ru', True, '"\\\n"@opa.ru'),
+        # RFC6068 special characters
+        (
+            "gorby%kremvax@example.com",
+            True,
+            '<a href="mailto:gorby%25kremvax@example.com">gorby%kremvax@example.com</a>',
+        ),
+        (
+            "unlikely?address@example.com",
+            True,
+            '<a href="mailto:unlikely%3Faddress@example.com">unlikely?address@example.com</a>',
+        ),
     ],
 )
 def test_email_link(data, parse_email, expected):
@@ -115,15 +126,15 @@ def test_email_link(data, parse_email, expected):
     [
         (
             '"james"@example.com',
-            """<a href='mailto:"james"@example.com'>"james"@example.com</a>""",
+            """<a href="mailto:%22james%22@example.com">"james"@example.com</a>""",
         ),
         (
             '"j\'ames"@example.com',
-            """<a href="mailto:&quot;j'ames&quot;@example.com">"j'ames"@example.com</a>""",
+            """<a href="mailto:%22j%27ames%22@example.com">"j'ames"@example.com</a>""",
         ),
         (
             '"ja>mes"@example.com',
-            """<a href='mailto:"ja>mes"@example.com'>"ja&gt;mes"@example.com</a>""",
+            """<a href="mailto:%22ja%3Emes%22@example.com">"ja&gt;mes"@example.com</a>""",
         ),
     ],
 )

bug: `linkify` with `parse_email=True` doesn't handle "%" a "?" in `addr-specs`
**Describe the bug**

bug: `linkify` with `parse_email=True` doesn't handle "%" and "?", which may occur in RFC822 addr-specs (see https://datatracker.ietf.org/doc/html/rfc2368#section-6)

 - Python Version: 3.10.4
 - Bleach Version: 5.0.0

**To Reproduce**

Steps to reproduce the behavior:

```python
>>> bleach.linkify("gorby%kremvax@example.com", parse_email=True)
'<a href="mailto:gorby%kremvax@example.com">gorby%kremvax@example.com</a>'
```

**Expected behavior**

I expected RFC822 special characters to be percent-encoded according to RFC2368:

```python
>>> bleach.linkify("gorby%kremvax@example.com", parse_email=True)
'<a href="mailto:gorby%25kremvax@example.com">gorby%kremvax@example.com</a>'
```

**Additional context**

Same issue exists with "?"; I didn't test other RFC822 special characters but suspect they are similarly left unquoted.
tests/test_linkify.py::test_email_link[gorby%kremvax@example.com-True-<a tests/test_linkify.py::test_email_link[unlikely?address@example.com-True-<a tests/test_linkify.py::test_email_link_escaping["james"@example.com-<a tests/test_linkify.py::test_email_link_escaping["j'ames"@example.com-<a tests/test_linkify.py::test_email_link_escaping["ja>mes"@example.com-<a
tests/test_linkify.py::test_empty tests/test_linkify.py::test_simple_link tests/test_linkify.py::test_trailing_slash tests/test_linkify.py::test_mangle_link tests/test_linkify.py::test_mangle_text tests/test_linkify.py::test_email_link[a tests/test_linkify.py::test_email_link[aussie tests/test_linkify.py::test_email_link[email tests/test_linkify.py::test_email_link[<br>jinkyun@example.com-True-<br><a tests/test_linkify.py::test_email_link[mailto tests/test_linkify.py::test_email_link["\\\n"@opa.ru-True-"\\\n"@opa.ru] tests/test_linkify.py::test_prevent_links[callback0-a tests/test_linkify.py::test_prevent_links[callback1-a tests/test_linkify.py::test_prevent_links[callback2-a tests/test_linkify.py::test_prevent_links[callback3-a tests/test_linkify.py::test_prevent_links[callback4-a tests/test_linkify.py::test_prevent_links[callback5-a tests/test_linkify.py::test_set_attrs tests/test_linkify.py::test_only_proto_links tests/test_linkify.py::test_stop_email tests/test_linkify.py::test_tlds[example.com-<a tests/test_linkify.py::test_tlds[example.co-<a tests/test_linkify.py::test_tlds[example.co.uk-<a tests/test_linkify.py::test_tlds[example.edu-<a tests/test_linkify.py::test_tlds[example.xxx-<a tests/test_linkify.py::test_tlds[bit.ly/fun-<a tests/test_linkify.py::test_tlds[example.yyy-example.yyy] tests/test_linkify.py::test_tlds[brie-brie] tests/test_linkify.py::test_escaping[< tests/test_linkify.py::test_escaping[<U tests/test_linkify.py::test_nofollow_off tests/test_linkify.py::test_link_in_html tests/test_linkify.py::test_links_https tests/test_linkify.py::test_add_rel_nofollow tests/test_linkify.py::test_url_with_path tests/test_linkify.py::test_link_ftp tests/test_linkify.py::test_link_query tests/test_linkify.py::test_link_fragment tests/test_linkify.py::test_link_entities tests/test_linkify.py::test_escaped_html tests/test_linkify.py::test_link_http_complete tests/test_linkify.py::test_non_url tests/test_linkify.py::test_javascript_url tests/test_linkify.py::test_unsafe_url tests/test_linkify.py::test_skip_tags tests/test_linkify.py::test_libgl tests/test_linkify.py::test_end_of_sentence[example.com-.] tests/test_linkify.py::test_end_of_sentence[example.com-...] tests/test_linkify.py::test_end_of_sentence[ex.com/foo-.] tests/test_linkify.py::test_end_of_sentence[ex.com/foo-....] tests/test_linkify.py::test_end_of_clause tests/test_linkify.py::test_sarcasm tests/test_linkify.py::test_wrapping_parentheses[(example.com)-expected_data0] tests/test_linkify.py::test_wrapping_parentheses[(example.com/)-expected_data1] tests/test_linkify.py::test_wrapping_parentheses[(example.com/foo)-expected_data2] tests/test_linkify.py::test_wrapping_parentheses[(((example.com/))))-expected_data3] tests/test_linkify.py::test_wrapping_parentheses[example.com/))-expected_data4] tests/test_linkify.py::test_wrapping_parentheses[(foo tests/test_linkify.py::test_wrapping_parentheses[http://en.wikipedia.org/wiki/Test_(assessment)-expected_data7] tests/test_linkify.py::test_wrapping_parentheses[(http://en.wikipedia.org/wiki/Test_(assessment))-expected_data8] tests/test_linkify.py::test_wrapping_parentheses[((http://en.wikipedia.org/wiki/Test_(assessment))-expected_data9] tests/test_linkify.py::test_wrapping_parentheses[(http://en.wikipedia.org/wiki/Test_(assessment)))-expected_data10] tests/test_linkify.py::test_wrapping_parentheses[(http://en.wikipedia.org/wiki/)Test_(assessment-expected_data11] tests/test_linkify.py::test_wrapping_parentheses[hello tests/test_linkify.py::test_parentheses_with_removing tests/test_linkify.py::test_ports[http://foo.com:8000-expected_data0] tests/test_linkify.py::test_ports[http://foo.com:8000/-expected_data1] tests/test_linkify.py::test_ports[http://bar.com:xkcd-expected_data2] tests/test_linkify.py::test_ports[http://foo.com:81/bar-expected_data3] tests/test_linkify.py::test_ports[http://foo.com:-expected_data4] tests/test_linkify.py::test_ports[http://foo.com:\u0663\u0669/-expected_data5] tests/test_linkify.py::test_ports[http://foo.com:\U0001d7e0\U0001d7d8/-expected_data6] tests/test_linkify.py::test_ignore_bad_protocols tests/test_linkify.py::test_link_emails_and_urls tests/test_linkify.py::test_links_case_insensitive tests/test_linkify.py::test_elements_inside_links tests/test_linkify.py::test_drop_link_tags tests/test_linkify.py::test_naughty_unescaping[&lt;br&gt;-&lt;br&gt;] tests/test_linkify.py::test_naughty_unescaping[&lt;br&gt; tests/test_linkify.py::test_hang tests/test_linkify.py::test_hyphen_in_mail tests/test_linkify.py::test_url_re_arg tests/test_linkify.py::test_email_re_arg tests/test_linkify.py::test_recognized_tags_arg tests/test_linkify.py::test_linkify_idempotent[<span>text tests/test_linkify.py::test_linkify_idempotent[a tests/test_linkify.py::test_linkify_idempotent[link tests/test_linkify.py::test_linkify_idempotent[text<em>] tests/test_linkify.py::test_linkify_idempotent[jim tests/test_linkify.py::test_linkify_idempotent[<a tests/test_linkify.py::TestLinkify::test_no_href_links tests/test_linkify.py::TestLinkify::test_rel_already_there tests/test_linkify.py::TestLinkify::test_only_text_is_linkified tests/test_linkify.py::test_linkify_filter[abc-abc] tests/test_linkify.py::test_linkify_filter[example.com-<a tests/test_linkify.py::test_linkify_filter[http://example.com?b=1&c=2-<a tests/test_linkify.py::test_linkify_filter[http://example.com?b=1&amp;c=2-<a tests/test_linkify.py::test_linkify_filter[link: