To set up an account with secure connection to the mail server in an email client, follow these steps:
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Make sure a valid SSL certificate is assigned to the mail server in Plesk at Tools & Settings > SSL/TLS Certificates and domain's name in the certificate is the same as the name of Mail server.
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Click on the certificate name to find out for which domain name it was issued.
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When a valid SSL certificate is set up for a mail server and domain name is known, during configuration in a mail client, specify incoming and outgoing mail server name as domain name from step 2.
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Incoming server
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IMAP - use port 993 with SSL type.
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POP3 - use port 995 and enable the option This server requires an encrypted connection (SSL), if available.
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Outgoing server (SMTP) to use port 465 (or 587 if the submission port is enabled) with SSL or TLS type (depends on the server configuration).
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