Hi Timo,

Thank you for the response. I've sorted out my problem with the help of it. There was a big error i could find in error logs.

=========================================================================== Jul 09 11:22:10 Error: Raw backtrace: /usr/local/libexec/dovecot/deliver [0x80c7c50] -> /usr/local/libexec/dovecot/deliver(default_fatal_handler+0x33) [0x80c7d33] -> /usr/local/libexec/dovecot/deliver [0x80c756c] -> /usr/local/lib/dovecot/lda/lib90_cmusieve_plugin.so [0xb7f8524d] -> /usr/local/lib/dovecot/lda/lib90_cmusieve_plugin.so [0xb7f900d7] -> /usr/local/lib/dovecot/lda/lib90_cmusieve_plugin.so [0xb7f8fee2] -> /usr/local/lib/dovecot/lda/lib90_cmusieve_plugin.so(sieve_eval_bc+0x205) [0xb7f91135] -> /usr/local/lib/dovecot/lda/lib90_cmusieve_plugin.so(sieve_execute_bytecode+0xf3) [0xb7f96ba3] -> /usr/local/lib/dovecot/lda/lib90_cmusieve_plugin.so(cmu_sieve_run+0x311) [0xb7f868d1] -> /usr/local/lib/dovecot/lda/lib90_cmusieve_plugin.so [0xb7f844e4] -> /usr/local/libexec/dovecot/deliver(main+0x123d) [0x805bd5d] -> /lib/libc.so.6(__libc_start_main+0xe0) [0x327f70] -> /usr/local/libexec/dovecot/deliver [0x8059821]

It was sieve plugin which was not compatible with dovecot version. I upgraded the sieve plugin from 1.1.6 to 1.1.8 and the error stopped to come.

Have a nice time, Gourav Joshi http://www.linuxquestions.in