The GitHub issue can be found at: https://github.com/gocd/gocd/issues/8513

On Tuesday, 1 September 2020 at 13:02:54 UTC+2 Jeroen Oortwijn wrote:

> I decided to try the server on a fresh Ubuntu 20.04 installation, and 
> there the test email works perfectly!
>
> The following message appears:
> Connection OK
>
> And nothing get logged in the server log.
>
> I can also see the message in the mail account.
>
> I then decided to install the server on a clean Windows 10 (2004) 
> installation, and there I also get the same error:
> There was an unknown error performing the operation. Possible reason (Not 
> Acceptable)
>
> So it looks like sending mail messages (to this mail server) is broken on 
> Windows 10, but works on Ubuntu 20.04.
> I will file an issue on GitHub.
>
> - Jeroen
>
>
> On Thursday, 27 August 2020 at 17:05:20 UTC+2 Jeroen Oortwijn wrote:
>
>> Hello,
>>
>> I'm trying to set up the Email server on the GoCD server (
>> http://localhost:8153/go/admin/config/server#!email-server), but I can't 
>> get it to work.
>>
>> When I fill in all the details and click the Send Test Email button, 
>> after a while the following message appears:
>> There was an unknown error performing the operation. Possible reason (Not 
>> Acceptable)
>>
>> In the server log (go-server.log) appears the following:
>> 2020-08-27 16:51:18,460 ERROR [Thread-5048] GoSmtpMailSender:56 - Sending 
>> failed for email [Go Email Notification] to [gocd@***.**]
>> javax.mail.MessagingException: Exception reading response
>> at 
>> com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2460)
>> at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2187)
>> at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:740)
>> at javax.mail.Service.connect(Service.java:366)
>> at 
>> com.thoughtworks.go.config.GoSmtpMailSender.send(GoSmtpMailSender.java:51)
>> at 
>> com.thoughtworks.go.config.BackgroundMailSender.lambda$send$0(BackgroundMailSender.java:48)
>> at java.base/java.lang.Thread.run(Unknown Source)
>> Caused by: java.net.SocketTimeoutException: Read timed out
>> at java.base/sun.nio.ch.NioSocketImpl.timedRead(Unknown Source)
>> at java.base/sun.nio.ch.NioSocketImpl.implRead(Unknown Source)
>> at java.base/sun.nio.ch.NioSocketImpl.read(Unknown Source)
>> at java.base/sun.nio.ch.NioSocketImpl$1.read(Unknown Source)
>> at java.base/java.net.Socket$SocketInputStream.read(Unknown Source)
>> at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:126)
>> at java.base/java.io.BufferedInputStream.fill(Unknown Source)
>> at java.base/java.io.BufferedInputStream.read(Unknown Source)
>> at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:106)
>> at 
>> com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2440)
>> ... 6 common frames omitted
>>
>> Above messages aren't really helpful in debugging the problem, so I want 
>> to view the SMTP log, but couldn't find it.
>> Is there a way to enable the SMTP log and where is it then located?
>>
>> Kind regards,
>>
>> Jeroen Oortwijn
>>
>

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