I made a simple test application in C#:
namespace SMTP_send_email_test
{
class Program
{
static void Main(string[] args)
{
var mimeMessage = new MimeKit.MimeMessage();
mimeMessage.From.Add(new MimeKit.MailboxAddress("GoCD server",
"gocd@***.**"));
mimeMessage.To.Add(new MimeKit.MailboxAddress("GoCD server",
"gocd@***.**"));
mimeMessage.Subject = "Test message";
mimeMessage.Body = new MimeKit.TextPart() { Text = "This is a
test!" };
using (var smtpClient = new MailKit.Net.Smtp.SmtpClient(new
MailKit.ProtocolLogger("smtp.log")))
{
smtpClient.Connect("mail.antagonist.nl", 465,
MailKit.Security.SecureSocketOptions.SslOnConnect);
smtpClient.Authenticate("gocd@***.**", "********");
smtpClient.Send(mimeMessage);
smtpClient.Disconnect(true);
}
}
}
}
And when run on the same PC as the GoCD server is running, it was able to
send the mail (from smtp.log):
Connected to smtps://mail.antagonist.nl:465/
S: 220 smtp ESMTP ready
C: EHLO [10.0.2.15]
S: 250-smtp
S: 250 AUTH PLAIN LOGIN
C: AUTH PLAIN ****************
S: 235 2.0.0 OK
C: MAIL FROM:<gocd@***.**>
S: 250 OK
C: RCPT TO:<gocd@***.**>
S: 250 Accepted
C: DATA
S: 354 Enter message, ending with "." on a line by itself
C: From: GoCD server <gocd@***.**>
C: Date: Thu, 27 Aug 2020 18:37:21 +0200
C: Subject: Test message
C: Message-Id: <SP9BR6GPIBU4.QRAK6FVSVTCN2@***.**>
C: To: GoCD server <gocd@***.**>
C: MIME-Version: 1.0
C: Content-Type: text/plain; charset=utf-8
C:
C: This is a test!
C: .
S: 250 OK id=1kBKts-00B44l-6x
C: QUIT
S: 221 s188.webhostingserver.nl closing connection
So it would be nice if I can see the SMTP log of the GOCD server, so I can
further debug the issue.
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