Blocked port 25 is a false or real problem?

timesurfer

• May 10, 2019 05:30

Hi, I need to know if a blocked port 25 is a false or real problem. I have a VPS on Google GCE. But, Google blocks port 25, I believe both incoming and outgoing connections (but please correct me if I'm wrong) There is an option on WHM to use an alternate port (like 26, for example). My question is: - if I set up a VPS on Google, with WHM and cPanel, and use port 26 instead of 25, will everything work fine with my cPanel accounts (sending and receiving emails)? - or will I have some problems? If so, what kind of problems? Note: I know I could use Mailgun, Sendgrid and Mailjet as a relay host, but I prefer not to do that, in this VPS.

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  GOT

  • May 10, 2019 11:46

  Incoming mail on port 25 will work fine, Google is only blocking outbound port 25. However there is no way to get outbound mail to work with a port 25 block short of using some kind of smart host that works on a different port. You could though set up a vps in a different datacenter that does not block outbound 25 and use it as your own mail relay.

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  timesurfer

  • May 10, 2019 20:33

  Incoming mail on port 25 will work fine, Google is only blocking outbound port 25. However there is no way to get outbound mail to work with a port 25 block short of using some kind of smart host that works on a different port. You could though set up a vps in a different datacenter that does not block outbound 25 and use it as your own mail relay.

  
  Thank you for your answer. But, that means that every VPS on Google GCE is using a smart host to send emails?

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  GOT

  • May 10, 2019 20:36

  That does seem to be their policy: Sending Email from an Instance "|" Compute Engine Documentation "|" Google Cloud

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  cPanelMichael

  • May 10, 2019 21:57

  Hello @timesurfer, @GOT is correct. We recently published a couple of guides on setting up a smart host with cPanel & WHM if you decide to use one of these email providers: Let me know if you have any questions. Thank you.

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  timesurfer

  • May 11, 2019 06:18

  Thank you for both your answers. I know Sendgrid, Mailgun and Mailjet, and I've used their services for sending newsletters and I've also set up servers using them as a smart host. They work fine and easy to work with. They really are and impressed me. They do a fine job. But, that's not the point. The point is that sometimes you just need a server to send emails directly without using a smart host. And I thought there was a way of doing that in Google GCE. I guess I have to use another ISP in this cases.

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