Postfix Issue and solution

Following are Postfix issues and solution.

Issue
error log: unable to lock for exclusive access: Resource temporarily unavailable
Solution
Edit /etc/postfix/mail.cf & /etc/dovecot.conf
The lock settings have to configure same. ex:
mail.cf

mailbox_delivery_lock = flock, dotlock

dovecot.conf

mbox_read_locks = flock dotlock
mbox_write_locks = flock dotlock