Horde seems to have cached deleted contacts... how can I clear them?

[Alexander Haensch]

I think caching in IMP is not responsible here. IMP will only cache  
your messagelist and some messages.
We also had some problem with the messagelist of the inbox not showing  
recent changes, made with another imap client like thunderbird.

I changed in imp/config/conf.php

$conf['msgcache']['lifetime'] = 3600; # Was 1 month
$conf['mlistcache']['lifetime'] = 3600; # was 1 week

Now it works much better.

regards,
Alexander Haensch