>> I've done something very similar. I have a delivery timestamp column
>> in the table that is initially NULL, and I set it to UTC_TIMESTAMP()
>> for each row as I send the message. My query looks like this then:
>>
>> SELECT * FROM mail_queue WHERE delivery_timestamp IS NULL LIMIT 100.
>>
>> Andrew
>>
>>   
> Then what do you do to get the next 100 emails without sending the same
> ones

Re-read the reply.

After each email is sent, the timestamp is set.

The original query looks for timestamp fields that are not set.

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