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