SMTP

  • swaks – command line SMTP testing tool.
  • mailtrap – SMTP server for development.

Cloud providers like Amazon AWS, Alibaba, Microsoft Azure, Google Cloud and DigitalOcean do not allow you to run your own mail server. If you need to sent email from your web application, you need to use one of the Transnational Email Services.

Amazon AWS

Amazon EC2
Amazon Lightsail rDNS

Alibaba Cloud

AlibabaCloud DirectMail
https://www.alibabacloud.com/help/faq-detail/56130.htm

Google Cloud

https://cloud.google.com/compute/docs/tutorials/sending-mail/

Microsoft Azure

https://blogs.msdn.microsoft.com/mast/2017/11/15/enhanced-azure-security-for-sending-emails-november-2017-update/

DigitalOcean

They only allow SMTP after 60 days of use to avoid spam. Source: See pinned answer by alexdo

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