Overview

When there is a need to configure SMTP outbound relay (Mail Gateway), the specific Kerio Connect settings in SMTP Delivery should be applied.

One specific use case where this knowledge is applicable is when your ISP blocks outbound SMTP port 25, and you need to use another port to send outbound emails. Please note that changing the SMTP service port to something else (for example 465 or 587) will lead to incoming emails failing to deliver, therefore, a 3rd party relay needs to be used, as those usually employ additional ports.

As an example, the process below covers using SMTP (Simple Mail Transfer Protocol) delivery rules to relay Kerio Connect emails through the Yandex Mail service.

Prerequisites

• Access to Kerio Connect administration console.
• (Optional, you can replace it by your preferred provider) Yandex Mail Account.

Solution

Log into Kerio Connect administration console and follow these steps:

1. Go to Configuration.
2. Click on SMTP Server.
3. Go to the SMTP Delivery tab, click Add and enter the following server information:
   • Condition: Set the Condition according to your preference.
   • Relay Server hostname: smtp.domain.com 
   • Relay server port: 25
   • Username / Password: Input your server credentials.
   • Authentication: SMTP AUTH Command
     
4. Click OK and Apply.
   Note: the SMTP relay settings should be set as per the 3-party provider instructions. Using Yandex as example, the settings will be the following:
   1. Relay Server hostname: smtp.yandex.com or smtp.yandex.ru (for the Russian server)
   2. Username/Password: If your email address is @yandex.com, input only the characters before the @ symbol.

Testing

Kerio Connect starts sending emails through the SMTP Outbound Relay.

In the case of the ISP blocking outbound connections on SMTP port 25, the email relay will use the port you have configured using the above steps.

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