[Dovecot] Need more info on new fsync switch

[interfaSys sàrl]

 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example in the Wiki is outdated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