How to enable 587 submission port on a Plesk for Linux server?

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    Andre Drave

    Hello, 

    thank you very much for the information. I have a question about this. Does this setting enable/disable STARTTLS? Since a few days I am dealing with an issue that affects iOS and iPad OS. Here I have problems to establish a connection over port 465 for implicit TLS, to my Plesk server. For this reason I have enabled this setting: "Enable SMTP service on port 587 on all IP addresses". But I actually want to prevent STARTTLS from being used, as this is still error prone and "insecure" compared to SSL/TLS!

    Greetings

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