I can't send emails via AMP, using my own email server

Technical Support
,
1

OS Name/Version: Unraid 6.12.4

Product Name/Version: AMP Release “Decadeus” v2.4.6.8

Problem Description:

I can’t send emails via AMP, using my own email server, even though I have specified everything. And the log doesn’t help me either.

Steps to reproduce:

:admin
10:44:59

Unable to send email: System.Net.Mail.SmtpException: Message could not be sent. ---> System.IO.IOException: Connection closed at System.Net.Mail.SmtpClient.Read ()
[0x000bd] in <f2109503c3e3478285aacd4ff1d0db97>:0 at System.Net.Mail.SmtpClient.SendCore (System.Net.Mail.MailMessage message) [0x00000] in
<f2109503c3e3478285aacd4ff1d0db97>:0 at System.Net.Mail.SmtpClient.SendInternal (System.Net.Mail.MailMessage message) [0x00050] in <f2109503c3e3478285aacd4ff1d0db97>:0
at System.Net.Mail.SmtpClient.Send (System.Net.Mail.MailMessage message) [0x00084] in <f2109503c3e3478285aacd4ff1d0db97>:0 --- End of inner exception stack trace ---
at System.Net.Mail.SmtpClient+<>c__DisplayClass90_0.<SendAsync>b__0 (System.Object o, System.ComponentModel.DoWorkEventArgs ea) [0x0002c] in
<f2109503c3e3478285aacd4ff1d0db97>:0 at System.ComponentModel.BackgroundWorker.OnDoWork (System.ComponentModel.DoWorkEventArgs e) [0x0000a] in
<f2109503c3e3478285aacd4ff1d0db97>:0 at System.ComponentModel.BackgroundWorker.WorkerThreadStart (System.Object argument) [0x0000e] in
<f2109503c3e3478285aacd4ff1d0db97>:0 --- End of stack trace from previous location where exception was thrown --- at EmailSenderPlugin.PluginMain.SendMail
(System.String To, System.String Subject, System.String Message, System.Net.Mail.MailPriority Priority) [0x00160] in <c73a4339d28b460ea4c94acc62f30954>:0
Slow method invocation: TestSMTPSettings took 300259ms to complete.
Slow response: EmailSenderPlugin.TestSMTPSettings took 300261ms to complete.

Actions taken to resolve so far:

  • I have tried it without “Use SSL”
  • I tried it on a Debian 12 system.
  • I tried a simpler password to avoid errors caused by special characters
2

You’d want to look at your mail servers log. All that tells me is that the mail server closed the connection.

3

This is what I find in the Postfix log of my mail server.

01.12.2023, 11:08:57	info	disconnect from cable-100-10-10-140.internet.net[100.10.10.140] commands=0/0
01.12.2023, 11:08:57	info	lost connection after CONNECT from cable-100-10-10-140.internet.net[100.10.10.140]
01.12.2023, 11:08:57	info	SSL_accept error from cable-100-10-10-140.internet.net[100.10.10.140]: Connection timed out
01.12.2023, 11:03:57	info	connect from cable-100-10-10-140.internet.net[100.10.10.140]
4

What TLS protocols does your mail server support? AMP isn’t able to speak TLS 1.2/1.3 at this time so it’s limited to 1.1.

Edit: Also Unraid isn’t a supported platform, so there will be some things that I might not be able to help you with here.

5

My email server has discontinued support for TLS1.1.
I have now reactivated TLS 1.0/1.1 and tested it on Debian 12.

Testing SSL server mail.fastm.de on port 465 using SNI name mail.exampel.xyz

 SSL/TLS Protocols:
SSLv2     disabled
SSLv3     disabled
TLSv1.0   enabled
TLSv1.1   enabled
TLSv1.2   enabled
TLSv1.3   enabled

But I get the same error messages on the email server and in AMP.

Email server:

01.12.2023, 13:31:51    info    disconnect from unknown[100.10.10.140] commands=0/0
01.12.2023, 13:31:51    info    lost connection after CONNECT from unknown[100.10.10.140]
01.12.2023, 13:31:51    info    SSL_accept error from unknown[100.10.10.140]: Connection timed out
01.12.2023, 13:26:51    info    connect from unknown[100.10.10.140]

AMP:

13:31:51

Unable to send email: System.Net.Mail.SmtpException: Message could not be sent. ---> System.IO.IOException: Connection closed at System.Net.Mail.SmtpClient.Read ()
[0x000bd] in <f2109503c3e3478285aacd4ff1d0db97>:0 at System.Net.Mail.SmtpClient.SendCore (System.Net.Mail.MailMessage message) [0x00000] in
<f2109503c3e3478285aacd4ff1d0db97>:0 at System.Net.Mail.SmtpClient.SendInternal (System.Net.Mail.MailMessage message) [0x00050] in <f2109503c3e3478285aacd4ff1d0db97>:0
at System.Net.Mail.SmtpClient.Send (System.Net.Mail.MailMessage message) [0x00084] in <f2109503c3e3478285aacd4ff1d0db97>:0 --- End of inner exception stack trace ---
at System.Net.Mail.SmtpClient+<>c__DisplayClass90_0.<SendAsync>b__0 (System.Object o, System.ComponentModel.DoWorkEventArgs ea) [0x0002c] in
<f2109503c3e3478285aacd4ff1d0db97>:0 at System.ComponentModel.BackgroundWorker.OnDoWork (System.ComponentModel.DoWorkEventArgs e) [0x0000a] in
<f2109503c3e3478285aacd4ff1d0db97>:0 at System.ComponentModel.BackgroundWorker.WorkerThreadStart (System.Object argument) [0x0000e] in
<f2109503c3e3478285aacd4ff1d0db97>:0 --- End of stack trace from previous location where exception was thrown --- at EmailSenderPlugin.PluginMain.SendMail
(System.String To, System.String Subject, System.String Message, System.Net.Mail.MailPriority Priority) [0x00160] in <c73a4339d28b460ea4c94acc62f30954>:0
Slow method invocation: TestSMTPSettings took 300169ms to complete.
Slow response: EmailSenderPlugin.TestSMTPSettings took 300175ms to complete.
6

No idea then. It could be a network issue but because you’re using an unsupported platform I’ve no idea where to start. I’d suggest trying AMP in a normal VM and seeing if the problem persists.

7

I ran the last test on another standalone server, with Debian 12 and an AMD Ryzen 5 3600. Do I need to open a new ticket for this as it is a different server?

8

No - that’s fine. Do you get the same result?

9

Yes, I get the same results, the logs are from the Debian 12 server

10

I’m having the same issue using AMP with AWS SES, they don’t support TLS 1 or 1.1 and require 1.2 or newer; any chance we can get this updated anytime soon?

EDIT: To note, my install is on Ubuntu 22.04 LTS.

11

It’s not fixable until AMP is ported over to a newer framework which is some while away. For now I’d suggest using messaging methods other than email if you need TLS 1.2.

12

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