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Home » Kerio User Forums » Kerio Connect » Kerio Outlook Connector SMTP Port (Which inbound and outbound ports are used by KOC?)
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singhrahul

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Hi, i am just wondering which ports are used by Kerio Outlook Connector for inbound and outbound mails?
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GetSync'd

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Kerio Outlook Connector by default uses port 443 (HTTPS) for sending/receiving messages from the server. The port can be changed to something custom if desired. But you have to make sure you match that port with the HTTP or HTTPS service on the server.

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singhrahul

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why then i cannot send or receive emails from outside the domain, if i disable SMTP port 25?

if i disable smtp port 25 [service] i send a test from gmail, i dont receive it, and do not get a bounce message as well. Also, my outlook is configured as 143/465 [no kerio outlook conector]

Even if there is KOC, it would, as you say, use 443, then disabling smptp service [25] should not be a problem, but it looks likt it is.

Reason i am trying to disable port 25 is to prevent spambots from using that port to relay mail.

[Updated on: Tue, 21 July 2015 23:13]

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Pavel Dobry (Kerio)

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If you disable port 25, noone from the Internet will be able to send you any message. This port is used for receiving emails from other servers so you need to have this open (unless you use POP3 download from another mail server).

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