DevOps & SysAdmins: Cannot send email from EC2 instance on port 587 (2 Solutions!!)

DevOps & SysAdmins: Cannot send email from EC2 instance on port 587 (2 Solutions!!)

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DevOps & SysAdmins: Can't send mail from amazon ec2 instance
DevOps & SysAdmins: Can't send mail from amazon ec2 instance
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