17.8 Client configuration
The server supports standard-compliant email clients using the following IANA ports:
• imap/143
• pop3/110
• smtp/587
• sieve/4190
Authentication requires the STARTTLS command and supports the following variants:
• LOGIN
• PLAIN
• GSSAPI (only if NethServer is bound to Samba/Microsoft Active Directory)
Also the following SSL-enabled ports are available for legacy software that still does not support STARTTLS:
• imaps/993
• pop3s/995
• smtps/465
Warning:
The standard SMTP port 25 is reserved for mail transfers between MTA servers. Mail user agents
(MUA) must use the submission port.
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