Quote....A message that you sent has not yet been delivered to one or more of its
recipients after more than 48 hours on the queue on serenity.mcc.ac.uk.
Yes It is Serenity that is my problem too It is on and off the blocklist every day, current listing,
Query bl.spamcop.net - 130.88.200.93
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130.88.200.93 listed in bl.spamcop.net (127.0.0.2)
If there are no reports of ongoing objectionable email from this system it will be delisted automatically in approximately 17 hours.
Listing History
In the past 93.0 days, it has been listed 43 times for a total of 23.8 days
Great isnt it !!