use local mail daemon for confirmation links

frontend.py

@@ -5,9 +5,8 @@ from config import config
 from db import db
 import logging
 import tweepy
-import sendmail
+from sendmail import sendmail
 from session import SessionPlugin
-import smtplib
 from mastodon import Mastodon
 
 
@@ -28,20 +27,18 @@ def register_post():
     if db.by_email(email):
         return dict(error='Email address already in use.')
     # send confirmation mail
-    confirm_link = request.url + "/../confirm/" + db.user_token(email, password)
-    send_confirmation_mail(confirm_link, email)
+    sendmail(
+            email,
+            "[Ticketfrei] Confirm your account",
+            "Complete your registration here: %s://%s/confirm/%s" % (
+                    request.urlparts.scheme,
+                    request.urlparts.netloc,
+                    db.user_token(email, password)
+                )
+        )
     return dict(info='Confirmation mail sent.')
 
 
-def send_confirmation_mail(confirm_link, email):
-    m = sendmail.Mailer()
-    try:
-        m.send("Complete your registration here: " + confirm_link, email,
-               "[Ticketfrei] Confirm your account")
-    except smtplib.SMTPRecipientsRefused:
-        return "Please enter a valid E-Mail address."
-
-
 @get('/confirm/<token>')
 @view('template/propaganda.tpl')
 def confirm(token):

sendmail.py

@@ -1,11 +1,12 @@
 #!/usr/bin/env python3
-
-import smtplib
-import ssl
 from config import config
 from email.mime.text import MIMEText
 from email.mime.application import MIMEApplication
 from email.mime.multipart import MIMEMultipart
+from getpass import getuser
+import smtplib
+from socket import getfqdn
+import ssl
 
 
 class Mailer(object):
@@ -63,6 +64,17 @@ class Mailer(object):
         return "Sent mail to " + recipient + ": " + subject
 
 
+def sendmail(to, subject, body):
+    msg = MIMEMultipart()
+    msg['From'] = '%s@%s' % (getuser(), getfqdn())
+    msg['To'] = to
+    msg['Subject'] = subject
+    msg.attach(MIMEText(body))
+
+    with smtplib.SMTP('localhost') as smtp:
+        smtp.send_message(msg)
+
+
 # For testing:
 if __name__ == '__main__':
     m = Mailer()