[Dovecot] Need more info on new fsync switch

Hello, I wanted to improve performance by disabling fsync where I can, but the example in the Wiki is outdated http://wiki2.dovecot.org/MailLocation/LocalDisk

# Enable for IMAP/POP3 fsync_disable = yes

protocol lda { # Disable for LDA/LMTP fsync_disable = no }

Can that simply be replaced by the default config which is mail_fsync = optimized

Or should it be replaced by

# Enable for IMAP/POP3 mail_fsync = never

protocol lda { # Disable for LDA/LMTP mail_fsync = optimized }

Cheers,

Olivier