Help: Mail server refuses connection to port 143

Hi,
i am having this problem with accessing mail from my mac. It is a recurring problem everytime when i use Mail to access my .mac account.
This is what in shows- "There may be a problem with the mail server or network. Check the settings for account "[email protected]" or try again.
The server error encountered was: The server "mail.mac.com" refused to allow a connection on port 143."
I m very puzzled by this, it is a problem that happens on an 'on-off' basis, so sometimes it is ok and sometime it cannot access the server.
Please advice on this issue.
P.S i can access mail via Safari online.
cheers
2Ghz Macbook 'White'   Mac OS X (10.4.6)  

I'm not having the same problem.
It occurs every time you use the Mail.app to access your .Mac account and if so, how long have you had the account?
The default incoming mail server port for IMAP type accounts is 143 and since a .Mac type account is really an IMAP type account, are you accessing any other IMAP type accounts with the Mail.app?
How are you connected to the internet - via an Ethernet connection to a Cable or DSL modem or thru a wired or wireless router connected to same?

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    smtp_tls_mandatory_exclude_ciphers =
    smtp_tls_mandatory_protocols = SSLv3, TLSv1
    smtp_tls_note_starttls_offer = no
    smtp_tls_per_site =
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    smtp_tls_scert_verifydepth = 9
    smtp_tls_secure_cert_match = nexthop, dot-nexthop
    smtp_tls_security_level =
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    smtp_tls_verify_cert_match = hostname
    smtp_use_tls = no
    smtp_xforward_timeout = 300s
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    smtpd_authorized_xclient_hosts =
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    smtpd_client_connection_count_limit = 50
    smtpd_client_connection_rate_limit = 0
    smtpd_client_event_limit_exceptions = ${smtpd_client_connection_limit_exceptions:$mynetworks}
    smtpd_client_message_rate_limit = 0
    smtpd_client_new_tls_session_rate_limit = 0
    smtpd_client_port_logging = no
    smtpd_client_recipient_rate_limit = 0
    smtpd_client_restrictions = permit_mynetworks permit_sasl_authenticated reject_rbl_client zen.spamhaus.org permit
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    smtpd_discard_ehlo_keyword_address_maps =
    smtpd_discard_ehlo_keywords =
    smtpd_end_of_data_restrictions =
    smtpd_enforce_tls = no
    smtpd_error_sleep_time = 1s
    smtpd_etrn_restrictions =
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    smtpd_helo_required = yes
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    smtpd_history_flush_threshold = 100
    smtpd_junk_command_limit = 100
    smtpd_milters =
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    smtpd_policy_service_max_ttl = 1000s
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