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List:       imap
Subject:    Re: Notification of New E-mails
From:       Arnt Gulbrandsen <arnt () gulbrandsen ! priv ! no>
Date:       2002-09-10 12:31:24
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The 30-second delay you see is effectively a quality of implementation 
issue.

The MTA delivering the message into the mailstore isn't required to do 
that in any specific time: It can take 0.01 seconds or it can take 15 
seconds, depending on luck and system load. Similarly, the IMAP server 
isn't required to notice the new mail at once. It's permitted to check 
every second or every minute, or alternatively it may be notified by 
the delivery agent.

In either case the SMTP/LMTP/POP/IMAP requirements are met, and if you 
want to write an IMAP client that interoperates well with the existing, 
deployed servers, you should try not to depend on anything else.

<truism>If you use a better server, you get better overall 
service.</truism>

The other approach I suggested should be faster (but hardly anyone 
implements it yet). 
ftp://ftp.ietf.org/internet-drafts/draft-shapira-snap-04.txt is the 
current draft.

--Arnt
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