Using IMAP from remote client as opposed to localhost

======== Required information ====
- iRedMail version: 0.8.6
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MySQL
- Linux/BSD distribution name and version: 12.0.4 Ubuntu
- Related log if you're reporting an issue:
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I am able to retrieve emails using explicit calls to IMAP locally.  The problem is that if I run the same function from a remote machine, I am not able to connect to the IMAP anymore.

If need to change granting privileges for a specific user in table mysql, please advise which one?  If not, please share how you would solve such issue.

Thanks