Add ability to override SES region

docs/administration.rst

@@ -295,6 +295,15 @@ Lemur supports sending certificate expiration notifications through SES and SMTP
         See: `Using sending authorization with Amazon SES <https://docs.aws.amazon.com/ses/latest/DeveloperGuide/sending-authorization.html>`_
 
 
+.. data:: LEMUR_SES_REGION
+    :noindex:
+
+    Specifies a region for sending emails via SES.
+
+    .. note::
+        This parameter defaults to us-east-1 and is only required if you wish to use a different region.
+
+
 .. data:: LEMUR_EMAIL
     :noindex:
 

lemur/plugins/lemur_email/plugin.py

@@ -61,7 +61,10 @@ def send_via_ses(subject, body, targets):
     :param targets:
     :return:
     """
-    client = boto3.client("ses", region_name="us-east-1")
+    ses_region = current_app.config.get("LEMUR_SES_REGION")
+    if not ses_region:
+        ses_region = "us-east-1"
+    client = boto3.client("ses", region_name=ses_region)
     source_arn = current_app.config.get("LEMUR_SES_SOURCE_ARN")
     args = {
         "Source": current_app.config.get("LEMUR_EMAIL"),