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I am trying to use Exim4 as my email server on Windows Azure. I found Exim4 uses STARTTLS to do SMTPS, and the port number is 587. The problem is I opened 587 in Azure vm Endpoints, but I can not use the port, even telnet is not successful. so I'm wondering whether Azure blocks port 587 or my ISP blocks it?

Thanks in advance!!

billbash
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You need to open the end point as you have done as well as opening that port on the firewall inside the actual VM (Windows firewall or the equivalent on Linux, depending on which OS you are running).

flytzen
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  • Unfortunately I am not using Windows, I'm running SMTP on Linux, I've opened ports on both firewalls and Endpoints. – billbash Jun 28 '15 at 10:48
  • Yes, it wasn't clear from your question, hence why I put it in brackets :) Please update your question to clarify that you have opened it on the firewall in the VM as well. I will leave the answer here in case someone else comes across it in a search. FWIW, Azure does not block arbitrary ports - if you open them in the endpoint *and* in your firewall on the VM, that traffic will get to you. If it is still isn't working, you need to look at the software on your VM. – flytzen Jun 28 '15 at 10:54
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Azure is not blocking port 587. If You use submission on STARTTLS try to open both 587/tcp and 587/udp. If no success, try to remove endpoint and recreate it (be sure that there is no misconfigured ACLs on endpoints). Also be sure that there is no blocking rules in iptables.

Michał Smereczyński
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