You’ll find them in your dashboard under Email → Settings, there's an icon at the top icon where it says "Configuring Email Clients", but here’s the standard setup:
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IMAP (for receiving mail):
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Server:
my.your-domain.tld -
Port: 993
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Security: TLS
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Username/password: your email + password
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SMTP (for sending mail):
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Server:
my.your-domain.tld -
Port: 587
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Security: STARTTLS
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Username/password: your email + password
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Sieve (for mail filters):
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Server:
my.your-domain.tld -
Port: 4190
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Security: TLS
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Username/password: your email + password
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POP3 is off by default but can be enabled per mailbox.