Kerio Connect open ports

Service (default port)

Incoming connection

SMTP (25)

allow

SMTPS (465)

allow

SMTP Submission (587)

allow

POP3 (110)

deny

POP3S (995)

allow

IMAP (143)

deny

IMAPS (993)

allow

NNTP (119)

deny

NNTPS (563)

allow

LDAP (389)

deny

LDAPS (636)

allow

HTTP (80, 4040, 8800)

deny

HTTPS (443, 4040, 8843)

allow

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