vCenter 6.5 can't send E-Mail notification

[V9X9]

Hi Community,

my new vCenter Server 6.5 can't send notification E-Mails.

I have add the SMTP-Server (on the old vCenter 6.0 works without problems...)

I saw the Error-Message in the Log-File:

[VpxdMail] Failed to send the mail to SMTP server 192.168.0.99 at port 25. Error=Unknown com error

All other Parts from the vCenter works...

have someone a idea whats happen?

The vCenter-Server is a Windows 2016 Core installation.

thanks Lars

[jfene72]

Have you checked the firewall settings on the Windows server itself? Try a telnet 192.168.0.99 25 and see if you get a reply.

[V9X9]

yes, i have made some tests and turned it off.

it's all the same, the local firewall have nothing to do with that error.

on the old vCenter 6.0 it works without problems.

the SMTP runs also without problems.

[jfene72]

Have you seen this -> VMware Knowledge Base

[V9X9]

Yes, I saw that.

from that Log-File I have my error Message: Unknown com error

[hussainbte]

Have you added the new vCenter IP in exchange relay with anonymous authentication?

[Finikiez]

Do you use vcenter appliance or VC on windows?

If you have VC appliance check message on vcsa for any sendmail errors first.

[Yeujs]

I have meet the Same issue, is there someone can help?

2018-02-11T07:32:02.437+01:00 error vpxd[05576] [Originator@6876 sub=Mail_win32] [VpxdMail] Failed to send the mail to SMTP server  at port 25. Error=Unknown com error

The same com error, and Vcenter=6.0

Windows 2012 server core.

[hussainbte]

Use the below link to test email connectivity with exchange server with anonymous auth.

share the results

vCenter still does not support authenticated email connectivity, so you have to make sure you have allowed anonymous in your exchange.

Testing Anonymous SMTP Connections | Ivanti User Community