kmail refuses to check for new mail

[Donatas G.]

Strange thing: when I use a 3G modem to connect to internet in my laptop and 
not wireless/wired network connection, kmail refuses to check for new mail... 

Or rather, once I push "Check Mail On" button, the status bar of Kmail 
says: "Sending finished. No new letters". This happens on imap account that I 
know does have a lot of new mail, it happens also at an attempt to synch a 
folder... It does the same when there is no internet connection (previously 
kmail would still try and give a lot of „could not connect“ messages as a 
result...

How do I troubleshoot that? Could that be some new feature of kmail, that it 
checks mail only when some network interface is up (and programmers forgot 
about ppp0)?

The same strange behaviour was noticeable in Konqueror - it would say a 
webpage is not reachable at once without even trying (firefox opened pages 
fine). This behaviour stopped when I disabled usage of cachee for Konqueror.

By the way, kmail still sends mail fine - this one got through!

-- 
Donatas Glodenis
http://dg.lapas.info