Symptoms
Unable to send emails via mail client with the smtp 587 port configured.
Cause
Expected behaviour.
When the option Tools & Settings > Mail Server Settings > Enable SMTP service on port 587 on all IP addresses is disabled, the service is not used and thus port is not opened.
Resolution
If it is required, open port 587 by following the next steps
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Go to Tools & Settings > Mail Server Settings.
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Turn on the Enable SMTP service on port 587 on all IP addresses directive and press the OK button.
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