HestiaCP Mail Ports
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Some email clients such as Thunderbird will interrogate the mail server for information, such as the host name and available ports. However, some clients wont and you'll need to enter this information in manually.

Username: Is often your email address or the first part of your email address before the @ symbol
Password: The password you use to access the mailbox. 
Hostname: mail.YOURDOMAIN.co.uk

Incoming - IMAP Settings - leaves the emails on your server  
Authentication Normal Password
SSL/TLS Port: 993
STARTTLS Port: 143
No encryption Port: 143

| incoming - pop3 settings - downloads email from the 

incoming - pop3 settings - downloads email to your device  
Authentication Normal Password
SSL/TLS Port: 995
STARTTLS Port: 110
No encryption Port: 110
outgoing - SMTP Settings  
Authentication Normal Password
SSL/TLS Port: 465
STARTTLS Port: 587
No encryption Port: 25

If you are using HestiaCP - If the settings within the control panel are enabled, Hestia will automatically setup RoundCube webmail access. 

Example URL: https://webmail.YOURDOMAIN.co.uk

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