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If you only had 20 emails and each email takes a second to query, then a for loop would work fine. But what if you have 100,000 emails? You really need to be able to wake up a component, get a small batch of say 10, iterate and store the next ID and then get the next 10 and so on.

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title Create a custom number field called 'NextId' and set it to the value 156 in your card
NextId First, in config.json add your Custom Fields. Then go to your component card and set the value to 156. Note: You’ll need to change your component to use the DEVELOPMENT commit to see the newly added custom field. See Choosing the code to run for your component.

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title COUNTset("NextId", NextId) is how we set the count value
title	COUNTset saves the new value of the custom field in the custom field value file. Code Block language lua COUNTset("NextId", NextId)
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This means we can see the NextId in the card view of the component - and we can set it too!
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require "COUNT.COUNT"

function main(Data)
   --Poll the component every 2 seconds
   component.setTimer{delay=2000}
   local NextId = COUNTget("NextId")
   NextId = NextId+1
   COUNTset('NextId', NextId)
end

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title Run the component from the component card view and see the NextId value change.
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This is a very useful pattern for lots of Feeder interfaces. It’s used as part of the IMAP Email Feed component.