diff --git a/certbot/cli.py b/certbot/cli.py
index 97b1a5399..b4460f681 100644
--- a/certbot/cli.py
+++ b/certbot/cli.py
@@ -265,8 +265,9 @@ class HelpfulArgumentParser(object):
         self.VERBS = {"auth": main.obtain_cert, "certonly": main.obtain_cert,
                       "config_changes": main.config_changes, "run": main.run,
                       "install": main.install, "plugins": main.plugins_cmd,
-                      "renew": main.renew, "revoke": main.revoke,
-                      "rollback": main.rollback, "everything": main.run}
+                      "register": main.register, "renew": main.renew,
+                      "revoke": main.revoke, "rollback": main.rollback,
+                      "everything": main.run}
 
         # List of topics for which additional help can be provided
         HELP_TOPICS = ["all", "security", "paths", "automation", "testing"] + list(self.VERBS)
@@ -591,6 +592,11 @@ def prepare_and_parse_args(plugins, args, detect_defaults=False):
              "certificates. Updates to the Subscriber Agreement will still "
              "affect you, and will be effective 14 days after posting an "
              "update to the web site.")
+    helpful.add(
+        None, "--update-registration", action="store_true",
+        help="With the register verb, indicates that details associated "
+             "with an existing registration, such as the e-mail address, "
+             "should be updated, rather than registering a new account.")
     helpful.add(None, "-m", "--email", help=config_help("email"))
     # positional arg shadows --domains, instead of appending, and
     # --domains is useful, because it can be stored in config
diff --git a/certbot/main.py b/certbot/main.py
index 309889e8e..08a5a3ea4 100644
--- a/certbot/main.py
+++ b/certbot/main.py
@@ -10,6 +10,7 @@ import traceback
 
 import zope.component
 
+from acme import errors as acme_errors
 from acme import jose
 
 import certbot
@@ -363,6 +364,33 @@ def _init_le_client(config, authenticator, installer):
     return client.Client(config, acc, authenticator, installer, acme=acme)
 
 
+def register(config, unused_plugins):
+    """Create or modify accounts on the server."""
+
+    # Currently, only --update-registration is implemented. Issue #2446
+    # calls for a fuller register verb, to allow better separation of
+    # account management from obtaining certs.
+    if not config.update_registration:
+        return "Currently, only register --update-registration is implemented."
+    if config.email is None:
+        return ("Currently, --update-registration can only change the e-mail "
+                "address\nassociated with an account. A new e-mail address is "
+                "required\n(hint: --email)")
+    acc, acme = _determine_account(config)
+    acme_client = client.Client(config, acc, None, None, acme=acme)
+    try:
+        updated_reg = client.messages.Registration.from_data(email=config.email)
+        acme_client.acme.update_registration(acme_client.account.regr,
+                                             updated_reg)
+    except acme_errors.UnexpectedUpdate:
+        # We expect the unexpected update!
+        pass
+    query_data = acme_client.acme.query_registration(acme_client.account.regr)
+    # We rely on an ACME exception to interrupt this process if it didn't work.
+    print("Registration change succeeded. New registration data:\n")
+    print(query_data)
+
+
 def install(config, plugins):
     """Install a previously obtained cert in a server."""
     # XXX: Update for renewer/RenewableCert