smtp port 25 blocked by Internet Service Provider
Hi I installed an Exchange 2013 under Windows 2012 server. I have no pb to receive emails but it is impossible to send any email with the send-connector: 451 4.4.0 Primary target IP address responded with: 421 4.2.1 Unable to connect. Attempted failover to alternate host, but that did not succeed. I called my Internet provider which said to me that the port 25 has been blocked because of spamming. So, I would like to know: is it possible to change the smtp port for instance 587 instead of 25? thanks in advance, Bruno Grandjean
January 14th, 2013 4:38pm

i found myself the solution by using PowerShell. Open Exchange Management Shell and type: Set-SendConnector -Identity "SENDCONNECTORNAME" -port 587 check the change with: Get-SendConnector -Identity "SENDCONNECTORNAME" | fl I am using an active host in my sendConnector with basic auth I unchecked TLS boot and checked dns parameters I can now send email. Do you know how to proceed with the new exchange 2013 web interface? I'm more than interested! Hope it will help you especially if you are using a dyndns domain with a dynamic IP like me (test purpose). Bruno Grandjean
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January 14th, 2013 5:09pm

Hi Bruno, Thanks for your sharing. I would help you change the thread type from Question to Common. Your understanding would be appreciated. Fiona Liao TechNet Community Support
January 15th, 2013 4:10am

Hello Fiona Well, it is always a question because I don't know how to change the smtp port in the new Exchange 2013 web interface. So I am still waiting for a reply.. all the best Bruno
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January 15th, 2013 4:19am

Hi Bruno, Sorry for my misunderstanding. To change the network port in Exchange 2007 and Exchange 2010, we may use domain security with TLS; however, in Exchange 2013, there is no document about it based on my research. I'd suggest you use a firewall to force the network port change. Refer to: http://technet.microsoft.com/en-us/library/bb123543(v=exchg.141).aspx Hope it is helpful.Fiona Liao TechNet Community Support
January 15th, 2013 9:28pm

Hello Fiona Thks for replying to me so quickly. My Powershell command gave to me satisfaction up to now. According to your search, it seems there is no possibility to change the smtp port in the new Exchange 2013 web interface. best regards Bruno
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January 16th, 2013 3:05am

Hi Bruno, Sorry for my misunderstanding. To change the network port in Exchange 2007 and Exchange 2010, we may use domain security with TLS; however, in Exchange 2013, there is no document about it based on my research. I'd suggest you use a firewall to force the network port change. Refer to: http://technet.microsoft.com/en-us/library/bb123543(v=exchg.141).aspx Hope it is helpful.Fiona Liao TechNet Community Support
January 16th, 2013 5:23am

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