GAE's Mail Python API
GAE提供Mail API可供開發人員撰寫寄信程式，這邊以Python為例稍微紀錄一下
首先將google.appengine.api.mail import進來。
from google.appengine.api import mail
mail.is_email_valid可以檢驗email的格式是否正確，但是筆者試驗是如Issue 7471:mail.is_email_valid returns True for invalid email addresses and URLs這邊網友所回報的一樣沒有效果。
var isValid = mail.is_email_valid(emailAddress)
mail.send_mail可以用來發送電子郵件，只要帶入寄件者、收件者、主旨、以及信件內文。基於安全理由，訊息的寄件者地址必須是應用程式管理員的電子郵件地址，或是已登入使用者的「Google 帳戶」電子郵件地址，。
mail.send_mail(sender, receiver, subject, message)
最後這邊實際來看個完整的範例程式：
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| from google.appengine.api import users | |
| from google.appengine.api import mail | |
| import webapp2 | |
| class MainHandler(webapp2.RequestHandler): | |
| def get(self): | |
| sender = self.request.get("sender") | |
| receiver = self.request.get("receiver") | |
| subject = self.request.get("subject") | |
| message = self.request.get("message") | |
| if not sender: | |
| user = users.get_current_user() | |
| sender = user.email() | |
| if(not mail.is_email_valid(sender) or not mail.is_email_valid(receiver)): | |
| self.response.write("Invalid Email Address...") | |
| return | |
| mail.send_mail(sender, receiver, subject, message) | |
| self.response.write("Mail sended...") | |
| application = webapp2.WSGIApplication([ | |
| ('/', MainHandler) | |
| ]) |
將範例程式佈署至Cloud，在Application的網址後面帶入sender、receiver、subject、以及message這幾個參數。沒意外的話信件就會照我們給的資訊發送出去。
