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Home » GFI User Forums » Kerio Connect » KC 9.3.1 patch 1 - mail queue increasing for x.pro.protection.outlook.com destinations only (4.3.2 451 4.7.500 Server busy. Please try again later - since 9.3.1 patch 1 update)
KC 9.3.1 patch 1 - mail queue increasing for x.pro.protection.outlook.com destinations only [message #150467] Tue, 09 November 2021 12:26 Go to next message
Pete Mitchell is currently offline  Pete Mitchell
Messages: 12
Registered: February 2017
Anyone come across the following?
Upgraded from KC 9.3.1 to 9.3.1 patch 1 this morning. Upgrade went fine.
Since then, the outbound message queue keeps filling up with messages destined from mail accounts on Microsoft (xxx.pro.protection.outlook.com)
The message is "4.3.2 451 4.7.500 Server busy. Please try again later"
I got it working once by stop/starting KC and 5 minutes after it was back up, the queue started clearing after I tried resending a single email.

Any ideas, short downgrading to 9.3.1 again or stop/starting the mail server every hour?
Re: KC 9.3.1 patch 1 - mail queue increasing for x.pro.protection.outlook.com destinations only [message #150470 is a reply to message #150467] Tue, 09 November 2021 17:13 Go to previous messageGo to next message
Bud Durland is currently offline  Bud Durland
Messages: 582
Registered: December 2013
Location: Plattsburgh, NY
We're on patch 1 and don't have that issue. I have learned that when outlook.com says "server busy, try again" sometimes it really means "we've blacklisted your server (because we can)". A quick Google search will yeaild the link to start the process to get off the list.
Re: KC 9.3.1 patch 1 - mail queue increasing for x.pro.protection.outlook.com destinations only [message #150473 is a reply to message #150470] Tue, 09 November 2021 20:30 Go to previous message
Pete Mitchell is currently offline  Pete Mitchell
Messages: 12
Registered: February 2017
Thanks for the information Bud. I'll look and see if any IPs are blacklisted.
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