Wouldn't it be possible to save a lot of space by compressing the 
contents of the various header tables?

dbmail_envelope
dbmail_headervalues
dbmail_fromfield
etc.

They all contain thousands of entries with the same value. In case of 
dbmail_envelope, it's just the date that differs, but all those 
automated e-mails have the same subject etc., that contents could be 
compressed.

It's not about disk space (just a bit), but more about content access 
speed and caching. Having thousands of same entries pollutes the cache, 
and having a DB should help reducing this problem.

When you're already working on compressing the contents, maybe there's 
an idea for this also?

mfg zmi
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