| Problems sending mail through Kerio - advice on using another SMTP server on the LAN? [message #129232] |
Thu, 28 April 2016 00:57  |
dave2ic
Messages: 8
Registered: April 2016
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We are running Kerio Connect on a Windows Server 2012 Essentials Server and been having problems for some time now with "4.4.2 Connection lost" timeouts sending email. This is not only using DNS - we have tried relaying through our ISP and even setup a free SendGrid account but experience similar problems with both.
We have logged a case with Kerio support and have even had them remotely looking at our server, but they have been upable to offer any help.
The problem in the main is with large-ish email attachment, and obviously a contributing factor here is we are on ADSL which has a slow upstream speed (around 800kbps). However, the old Exchange Server we previously used on the same connection has no problems. And while emails with attachments 10MB+ are a particular problem, often much smaller emails experience the same problems.
There are no problems with receiving email.
I'm at a point now of thinking I need to bypass Kerio's SMTP server and try an alternative SMTP server on the LAN for Kerio to relay through, and was just looking for some advice on doing this.
I'm inclined to think I should setup another SMTP server on another PC on the LAN - or could I install another SMTP server on the server and use a different port than port 25?
I see there are a number of free SMTP server options available for Windows. Does anyone have any recommendations for my purposes - just to act an outgoing relay server? Or should I just use the Windows SMTP service and set it up for relay?
Thanks for any advice.
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