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test that the SMTP server's EHLO name matches its reverse DNS name

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This commit is contained in:
Joshua Tauberer 2014-04-23 18:02:30 -04:00
parent 22ad668699
commit 1b4dd98270
1 changed files with 16 additions and 0 deletions
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16
tests/test_mail.py
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@ -2,6 +2,7 @@
# Tests sending and receiving mail by sending a test message to yourself.
import sys, imaplib, smtplib, uuid, time
import socket, dns.reversename, dns.resolver
if len(sys.argv) < 3:
print("Usage: tests/mail.py hostname emailaddress password")
@ -28,9 +29,24 @@ This is a test message. It should be automatically deleted by the test script.""
emailto=emailto,
subject=mailsubject,
)
# Connect to the server on the SMTP submission TLS port.
server = smtplib.SMTP(host, 587)
#server.set_debuglevel(1)
server.starttls()
# Verify that the EHLO name matches the server's reverse DNS.
ipaddr = socket.gethostbyname(host) # IPv4 only!
reverse_ip = dns.reversename.from_address(ipaddr) # e.g. "1.0.0.127.in-addr.arpa."
reverse_dns = dns.resolver.query(reverse_ip, 'PTR')[0].target.to_text(omit_final_dot=True) # => hostname
server.ehlo_or_helo_if_needed() # must send EHLO before getting the server's EHLO name
helo_name = server.ehlo_resp.decode("utf8").split("\n")[0] # first line is the EHLO name
if helo_name != reverse_dns:
print("The server's EHLO name does not match its reverse hostname. Check DNS settings.")
sys.exit(1)
print("SMTP EHLO name (%s) is OK." % helo_name)
# Login and send a test email.
server.login(emailaddress, pw)
server.sendmail(emailaddress, [emailto], msg)
server.quit()