SMTP BULK MAIL - DROP FOLDER ASSUMPTIONS

I am sending bulk mail using CDO through an SMTP server on the local machine.  It's all setup with reverse dns and a fully qualified domain.

Is it safe to assume that any message in the mailroot/drop folder is undeliverable due to no mailbox / server and so i should remove from my mailing list?  I'm thinking of scripting a file system object to read the folder and look for the to tag then remove it from my list.

Any thoughts?
andrewmilnerAsked:
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plimpiasConnect With a Mentor Commented:
The drop folder is used when local delivery takes place, otherwise it is qued for delivery to the outside world. If you smtp server is authoritive for a specific these domains then it woudl be safe to assume that either the name was typed in wrong, the mailbox doesn't exist, is disabled, or it doesn't have permission to deliver to it.
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plimpiasCommented:
No that is not the case, there are several reasons why it would be delivered to the drop folder not just because the mailbox doesn't exist. You can delete the contents of the folder with out causing any damage.
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andrewmilnerAuthor Commented:
what other reasons would there be for the message being in there?
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