diff --git a/sendgrid/helpers/mail/mail.py b/sendgrid/helpers/mail/mail.py
index 60c85c82c..c3828d75b 100644
--- a/sendgrid/helpers/mail/mail.py
+++ b/sendgrid/helpers/mail/mail.py
@@ -6,16 +6,16 @@ class Mail(object):
     """Creates the response body for v3/mail/send"""
     def __init__(
             self, from_email=None, subject=None, to_email=None, content=None):
-        self._from_email = None
-        self._subject = None
-        self._template_id = None
-        self._send_at = None
-        self._batch_id = None
-        self._asm = None
-        self._ip_pool_name = None
-        self._mail_settings = None
-        self._tracking_settings = None
-        self._reply_to = None
+        self.from_email = None
+        self.subject = None
+        self.template_id = None
+        self.send_at = None
+        self.batch_id = None
+        self.asm = None
+        self.ip_pool_name = None
+        self.mail_settings = None
+        self.tracking_settings = None
+        self.reply_to = None
         self._personalizations = None
         self._contents = None
         self._attachments = None
@@ -40,214 +40,91 @@ def get(self):
         """
         :return: response body dict
         """
-        mail = {}
-        if self.from_email is not None:
-            mail["from"] = self.from_email.get()
-        if self.subject is not None:
-            mail["subject"] = self.subject
-
-        if self.personalizations is not None:
-            mail["personalizations"] = [
-                personalization.get()
-                for personalization in self.personalizations
-            ]
-
-        if self.contents is not None:
-            mail["content"] = [ob.get() for ob in self.contents]
-
-        if self.attachments is not None:
-            mail["attachments"] = [ob.get() for ob in self.attachments]
-
-        if self.template_id is not None:
-            mail["template_id"] = self.template_id
-
-        if self.sections is not None:
-            sections = {}
-            for key in self.sections:
-                sections.update(key.get())
-            mail["sections"] = sections
-
-        if self.headers is not None:
-            headers = {}
-            for key in self.headers:
-                headers.update(key.get())
-            mail["headers"] = headers
-
-        if self.categories is not None:
-            mail["categories"] = [category.get() for category in
-                                  self.categories]
-
-        if self.custom_args is not None:
-            custom_args = {}
-            for key in self.custom_args:
-                custom_args.update(key.get())
-            mail["custom_args"] = custom_args
-
-        if self.send_at is not None:
-            mail["send_at"] = self.send_at
-
-        if self.batch_id is not None:
-            mail["batch_id"] = self.batch_id
-
-        if self.asm is not None:
-            mail["asm"] = self.asm.get()
-
-        if self.ip_pool_name is not None:
-            mail["ip_pool_name"] = self.ip_pool_name
-
-        if self.mail_settings is not None:
-            mail["mail_settings"] = self.mail_settings.get()
-
-        if self.tracking_settings is not None:
-            mail["tracking_settings"] = self.tracking_settings.get()
-
-        if self.reply_to is not None:
-            mail["reply_to"] = self.reply_to.get()
-        return mail
-
-    @property
-    def from_email(self):
-        return self._from_email
-
-    @from_email.setter
-    def from_email(self, value):
-        self._from_email = value
-
-    @property
-    def subject(self):
-        return self._subject
-
-    @subject.setter
-    def subject(self, value):
-        self._subject = value
-
-    @property
-    def template_id(self):
-        return self._template_id
-
-    @template_id.setter
-    def template_id(self, value):
-        self._template_id = value
-
-    @property
-    def send_at(self):
-        return self._send_at
-
-    @send_at.setter
-    def send_at(self, value):
-        self._send_at = value
-
-    @property
-    def batch_id(self):
-        return self._batch_id
-
-    @batch_id.setter
-    def batch_id(self, value):
-        self._batch_id = value
-
-    @property
-    def asm(self):
-        return self._asm
-
-    @asm.setter
-    def asm(self, value):
-        self._asm = value
-
-    @property
-    def mail_settings(self):
-        return self._mail_settings
-
-    @mail_settings.setter
-    def mail_settings(self, value):
-        self._mail_settings = value
-
-    @property
-    def tracking_settings(self):
-        return self._tracking_settings
-
-    @tracking_settings.setter
-    def tracking_settings(self, value):
-        self._tracking_settings = value
-
-    @property
-    def ip_pool_name(self):
-        return self._ip_pool_name
-
-    @ip_pool_name.setter
-    def ip_pool_name(self, value):
-        self._ip_pool_name = value
-
-    @property
-    def reply_to(self):
-        return self._reply_to
-
-    @reply_to.setter
-    def reply_to(self, value):
-        self._reply_to = value
+        mail = {
+            'from': self._get_or_none(self.from_email),
+            'subject': self.subject,
+            'personalizations': [p.get() for p in self.personalizations or []],
+            'content': [c.get() for c in self.contents or []],
+            'attachments': [a.get() for a in self.attachments or []],
+            'template_id': self.template_id,
+            'sections': self._flatten_dictionaries(self.sections),
+            'headers': self._flatten_dictionaries(self.headers),
+            'categories': [c.get() for c in self.categories or []],
+            'custom_args': self._flatten_dictionaries(self.custom_args),
+            'send_at': self.send_at,
+            'batch_id': self.batch_id,
+            'asm': self._get_or_none(self.asm),
+            'ip_pool_name': self.ip_pool_name,
+            'mail_settings': self._get_or_none(self.mail_settings),
+            'tracking_settings': self._get_or_none(self.tracking_settings),
+            'reply_to': self._get_or_none(self.reply_to),
+        }
+
+        return dict((key, value) for key, value in mail.items()
+                    if value is not None and value != [] and value != {})
+
+    def _get_or_none(self, from_obj):
+        return from_obj.get() if from_obj is not None else None
+
+    def _flatten_dictionaries(self, dicts):
+        list_of_dicts = [d.get() for d in dicts or []]
+        return dict((k, v) for d in list_of_dicts for k, v in d.items())
 
     @property
     def personalizations(self):
         return self._personalizations
 
     def add_personalization(self, personalizations):
-        if self._personalizations is None:
-            self._personalizations = []
-        self._personalizations.append(personalizations)
+        self._personalizations = self._ensure_append(
+            personalizations, self._personalizations)
 
     @property
     def contents(self):
         return self._contents
 
     def add_content(self, content):
-        if self._contents is None:
-            self._contents = []
-        self._contents.append(content)
+        self._contents = self._ensure_append(content, self._contents)
 
     @property
     def attachments(self):
         return self._attachments
 
     def add_attachment(self, attachment):
-        if self._attachments is None:
-            self._attachments = []
-        self._attachments.append(attachment)
+        self._attachments = self._ensure_append(attachment, self._attachments)
 
     @property
     def sections(self):
         return self._sections
 
     def add_section(self, section):
-        if self._sections is None:
-            self._sections = []
-        self._sections.append(section)
+        self._sections = self._ensure_append(section, self._sections)
 
     @property
     def headers(self):
         return self._headers
 
     def add_header(self, header):
-        if self._headers is None:
-            self._headers = []
         if isinstance(header, dict):
             (k, v) = list(header.items())[0]
-            self._headers.append(Header(k, v))
+            self._headers = self._ensure_append(Header(k, v), self._headers)
         else:
-            self._headers.append(header)
+            self._headers = self._ensure_append(header, self._headers)
 
     @property
     def categories(self):
         return self._categories
 
     def add_category(self, category):
-        if self._categories is None:
-            self._categories = []
-        self._categories.append(category)
+        self._categories = self._ensure_append(category, self._categories)
 
     @property
     def custom_args(self):
         return self._custom_args
 
     def add_custom_arg(self, custom_arg):
-        if self._custom_args is None:
-            self._custom_args = []
-        self._custom_args.append(custom_arg)
+        self._custom_args = self._ensure_append(custom_arg, self._custom_args)
+
+    def _ensure_append(self, new_items, append_to):
+        append_to = append_to or []
+        append_to.append(new_items)
+        return append_to