SMTP PORT Block

Taha Haider

• August 03, 2017 07:33

Hi, Our Datacenter has block Port 25 on their IPs. So I have enabled port 26 for SMTP through WHM > Service Configuration > Service Manager > ALLOW 26 and enabled them. I have enabled it from firewall as well. But still, it shows error as attached in the image

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  Jcats

  • August 03, 2017 14:48

  WHM > Service Configuration > Service Manager > ALLOW 26

  
  This is for incoming connections to your server, not outgoing. In order to get exim to send out a different port you most likely have to use port forwarding, it sounds a bit crazy to me that they would be blocking port 25, what happens if the mail server you are trying to send to only accept connections via port 25? You just never can communicate with that server then I suppose?

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  cPanelMichael

  • August 03, 2017 15:38

  Hello, Here's a link to a thread explaining why traffic over port 25 is required for email to work: change port 25 I recommend contacting your data center again to relay this information. Thank you.

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  Taha Haider

  • August 04, 2017 10:49

  They answered me this "Customers will need to employ the use of a Smart Host outside of the SoftLayer network to send email from their servers. A Smart Host is simply a relay host that relays SMTP traffic from an SMTP server, mail client, or any other service or programming language capable of handling SMTP. Servers typically send this type of traffic via the mail submission TCP ports 465 or 587. Customers can communicate with those or any custom port of their choosing only TCP port 25 is blocked. If you want to use your own email server on a custom port, use the documentation specific to your email service to configure a custom email port. "

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  Taha Haider

  • August 04, 2017 10:50

  This is for incoming connections to your server, not outgoing. In order to get exim to send out a different port you most likely have to use port forwarding, it sounds a bit crazy to me that they would be blocking port 25, what happens if the mail server you are trying to send to only accept connections via port 25? You just never can communicate with that server then I suppose?

  
  Exactly, they are saying to use a 3rd party relay smtp server which they trust

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  Infopro

  • August 04, 2017 11:03

  More Info: Outbound Email on Port 25 | IBM

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  Taha Haider

  • August 04, 2017 11:05

  More Info: Outbound Email on Port 25 | IBM

  
  Yes, i have no option other than relay smtp server

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