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Can't ping smtp.gmail.com. I've been using google smtp for email notification and it was working until this moment. The app is deployed using azure vm classic deployment - Windows Server 2012 r2. Firewall is disabled. I've tried to diagnose using telnet on port 587 but the result is "220 smtp.gmail.com ESMTP f125sm12740457pfc.91 - gsmtp Connection to host lost." telnet smtp.gmail.com 587 220 smtp.gmail.com ESMTP f125sm12740457pfc.91 - gsmtp Connection to host lost. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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App might have been spamming host and IP banned. You can check IP against blacklist and see. https://mxtoolbox.com/blacklists.aspx But Microsoft does not recommend using Azure VM (Service) as SMTP outgoing Mail server, recommendation is to use a mail relay service like sendgrid, smtpgo, etc... https://docs.microsoft.com/en-us/azure/virtual-network/troubleshoot-outbound-smtp-connectivity#recommended-method-of-sending-email Dead Link: https://blogs.msdn.microsoft.com/mast/2017/11/15/enhanced-azure-security-for-sending-emails-november-2017-update/

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