You may choose not to allow remote connections to all of these. In a multi-node environment, all nodes will need access to the ldap server or servers (389) and to the logger server (514), mta nodes will need access to lmtp on all mailbox nodes (7025), mailbox nodes will need admin port access to other mailbox nodes (7071). ========================================================================= External Access: These are ports typically available to mail clients. 25 smtp [mta] - incoming mail to postfix 80 http [mailbox] - web mail client 110 pop3 [mailbox] 143 imap [mailbox] 443 https [mailbox] - web mail client over ssl 465 smtps [mta] - incoming mail to postfix over ssl (Outlook only) 587 smtp [mta] - Mail submission over tls 993 imaps [mailbox] - imap over ssl 995 pops [mailbox] - pop over ssl 7071 https ...
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