User reported that all emails initated from APM were failing with the following error message in the APM log:
2019-06-20 01:54:09.4748Z Error <unknown> Ivara.Mail.SmtpPlugin.SmtpMessage [29] SmtpMessage::Send() - exception thrown EXCEPTION OCCURRED:SmtpException Server does not support secure connections. at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)at System.Net.Mail.SmtpClient.GetConnection()at System.Net.Mail.SmtpClient.Send(MailMessage message)at Ivara.Mail.SmtpPlugin.SmtpMessage.Send(Boolean bAutoSend)2019-06-20 01:54:09.4748Z Error <unknown> Ivara.Client.Callbacks.ClientEmail [29] ClientEmail::Execute() - Unable to send email
The SMTP permissions on the SMTP server were set correctly but the server was being blocked by network security. The user's IT team whitelisted the SMTP server and the email started working again.