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https://issues.apache.org/jira/browse/NUTCH-1861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16594141#comment-16594141
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Lewis John McGibbney commented on NUTCH-1861:
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Hi [~yossi] thanks for response

bq. Isn't SMTP only for sending (and relaying) messages? How can it be used for 
crawling?

When I opened this ticket my understanding of SMTP was much less (it is still 
not great however it is slightly better). Your description sounds correct.

bq. I assume crawling in this instance will be in the context of a specific 
user (with password), but this user may have access to multiple 
mailboxes/folders (at least with IMAP, I don't think POP3 supports such 
features). Do you intend to support multiple users/passwords?

Yes. These URI's would be injected as normal or read from configuration.

bq. Why did you choose Commons Net over JavaMail?

I was not sure which implementation was more suited to what we were looking to 
achieve. If JavaMail is the way to go, then I will code it up using that 
underlying library instead. 

> Implement POP3 Protocol
> -----------------------
>
>                 Key: NUTCH-1861
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1861
>             Project: Nutch
>          Issue Type: Task
>          Components: protocol
>            Reporter: Lewis John McGibbney
>            Assignee: Lewis John McGibbney
>            Priority: Major
>
> Implementing the Post Office Protocol within Nutch would open up a new use 
> case which is crawling and indexing of some mail servers.
> This is particularly useful for investigation purposes or for porting/mapping 
> mail from one server to another. 
> We *may* be able to kil two bird with the one stone by implementing both IMAP 
> and POP3 protocols under the one plugin.
> http://commons.apache.org/proper/commons-net/



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