Email access problem: "Temporary local problem – please try later"

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Registered
May 2, 2012
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Our client is being temporarily blocked from accessing email - they receive "Temporary local problem – please try later" message in Outlook.

When, I check exim_mainlog - I see the following error messages, can anyone advise on cause of problem / fix?

Thanks and kind regards, Roger


2012-05-02 06:20:09 H=emblematic.pndsl.co.uk (COMPUTER004) [80.229.164.123]:19341 Warning: "Detected sessio
n with all messages failed"
2012-05-02 06:20:09 H=emblematic.pndsl.co.uk (COMPUTER004) [80.229.164.123]:19341 Warning: "Increment slow_
fail_block Ratelimit - emblematic.pndsl.co.uk (COMPUTER004) [80.229.164.123]:19341 because of all messages
failed"
2012-05-02 06:20:09 SMTP connection from emblematic.pndsl.co.uk (COMPUTER004) [80.229.164.123]:19341 closed
by QUIT
2012-05-02 06:21:09 SMTP connection from [80.229.164.123]:19347 (TCP/IP connection count = 1)
2012-05-02 06:21:09 H=emblematic.pndsl.co.uk [80.229.164.123]:19347 temporarily rejected connection in "con
nect" ACL: "Host is ratelimited due to multiple failure only connections (5.8/1h max:5)"