Version: 1.2 (using KDE 3.4.90 (alpha1, >= 20050806), compiled sources) Compiler: gcc version 3.3.4 (pre 3.3.5 20040809) OS: Linux (i686) release 2.6.8-24.14-smp My setup is: one email address for GMX (the default) one email address for a different (2nd) provider If I receive a meeting request for the 2nd provider and want to accept it, it is sent via the default mail transport GMX. This email is rejected by GMX because the sender address is from a different domain. However if I reply to any email in the 2nd provider's inbox the correct email transport is choosen by default.
You can define a sender identity to use per folder, which can define a transport to use.