IMAP envelope command (was Re: NNTP and thunderbird-related lists)

Dan Mosedale dmose at
Fri Jul 30 21:08:15 UTC 2010

  On 7/30/10 1:47 PM, David Bienvenu wrote:
>  On 7/30/2010 1:31 PM, Dan Mosedale wrote:
>> Usually, an NNTP server spits out XOVER headers by streaming from a 
>> file stored on the server, and has a very compact representation for 
>> those headers. POP3 and IMAP don't have such an efficient mechanism 
>> for getting message headers (IMAP has an envelope command, but we had 
>> to stop using it because enough servers impls were broken that we 
>> were just hurting our users).
>> Interesting.  When did that disabling happen?
> Probably TB 1.5, iirc.
>> Is there any chance that server impls have gotten better in the time 
>> since that was last tried?
> Quite possibly. Iirc, it was the newer servers that were broken. I 
> could always turn it on again in nightlies and see what the fallout 
> is.  My main reluctance would be the potential support burden on yours 
> truly, which kinda sucks because it means a few users on broken 
> servers slow things down for everyone else.

I'd encourage it, since we can always turn it off if the support burden 
gets ugly.  That said, you're undoubtedly the only person with enough 
insight into your other priorities and the tradeoffs here to really make 
that call.


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