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Some clustered filesystems may not support fcntl, so you can change it to use
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flock instead. Fcntl locks may also cause problems with some NFS
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configurations, in which case you can try if switching to dotlocks helps. Note
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from 'lock_method' setting.
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Regardless of the 'lock_method' setting, Dovecot always uses dotlocks for some
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locks. Because of this, setting 'dotlock_use_excl=yes' will also improve the