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We are setting up a new production environment which utilizes the new Sitecore Email Cloud (Sparkpost and EXM 3.4). Our hosting vendor does not allow us to open for all traffic on port 587, so we need a hostname and/or an IP range to open. I have crawled the document but have only found this statement in doc.sitecore.net:

From the above it seems that I need to open up for all traffic to port 587, not only for the specific 4 URLs.

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  • please write to sitecore support about sparkpost smtp ip
    – Vlad Iobagiu
    Feb 6 '17 at 10:29
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    port 587 will only apply to the smtp.sitecore.sparkpostelite.com machine; https is port 443.
    – Richard Hauer
    Feb 6 '17 at 16:54
  • @RichardHauer: I just received the same response from Sitecore support. Could you create a response to this question, so that i can mark it as resolved?
    – pwind
    Feb 7 '17 at 7:41
  • See doc.sitecore.net/email_experience_manager/… Alternatively, you can also use the SMTP port 2525
    – Owin-wan-kenobi
    Apr 26 '18 at 13:22
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port 587 will only apply to the smtp.sitecore.sparkpostelite.com machine; https is port 443.

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    Please elaborate, i.e. by citing and linking relevant source information.
    – Mark Cassidy ♦
    Feb 7 '17 at 11:30
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    There's no way to elaborate on this. I think it was the IANA in the mid 90s that allocated port 443 to HTTPS. They would have done 587 as well. 587 is an SMTP port. This is just how the internet works
    – Richard Hauer
    Feb 7 '17 at 20:02
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The Sitecore documentation is referring to outgoing traffic from your server.

You need to open port 587 for outgoing traffic only. You can leave this port closed for incoming traffic.

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