> I plan to use JavaMail for one of my projects, where I need to download some
> emails from a IMAP store (gmail), and move them to a issue tracking system.
> Is there a way to validate that email was downloaded / fetched with no
> corruptions (or partial downlaods)?
No. Although generally you'll get an exception if there's a problem.
The biggest problems are usually *not* undetected corruption of the data,
but rather failures or bugs in the mail server.
> I understand from a response at stack overflow that "The IMAP protocol will
> tell you how many octets are going to be transfered when you issue the FETCH
> command.". Is there a way in JavaMail to get the value of "how many octects
> are going to be transfered", so I can cross check the file, once JavaMail
> API returns a success for a fetch?
You can use the getSize method, but see all the caveats in the javadocs.
> I also found getContentMD5 in IMAPMessage class. Do all IMAP servers support
> this? i.e. can I get the contentMD5 before fetching the message and then
> compare it to ensure completeness of the email?
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