Google Cloud Platform


An email message can include file attachments. The attachments field of an email message accepts a list of either two-value tuples, or Attachment objects.

If tuples are used, one tuple must be created for each attachment. The first element of each tuple is the filename to use for the attachment in the message, and the second element is the data, as a byte string.

from google.appengine.api import mail
from google.appengine.ext import ndb

class DocFile(ndb.Model):
    doc_name = ndb.StringProperty()
    doc_file = ndb.BlobProperty()

q = ndb.gql("SELECT * FROM DocFile WHERE doc_name = :1", myname)
results = q.fetch(1)
if results:
    doc = results[0]
                   to="Albert Johnson <>",
                   subject="The doc you requested",
Attached is the document file you requested.

The Team
                  attachments=[(doc.doc_name, doc.doc_file)])

As a security measure to protect against viruses, you cannot send email attachments—or zip files—containing any of the following extensions:

  • ade
  • adp
  • bat
  • chm
  • cmd
  • com
  • cpl
  • exe
  • hta
  • ins
  • isp
  • jse
  • lib
  • mde
  • msc
  • msp
  • mst
  • pif
  • scr
  • sct
  • shb
  • sys
  • vb
  • vbe
  • vbs
  • vxd
  • wsc
  • wsf
  • wsh