Email id's not visible in GUI

AFAIK the default OpenLDAP response limit is 500 entries. The client (UI) supports paged results. Perhaps the server does not.

Do you have any error in /var/log/messages?

BTW, assuming you have a local OpenLDAP accounts provider, you can increase the response limit with

ldapmodify -Y EXTERNAL <<EOF
dn: cn=config
changetype: modify
replace: olcSizeLimit
olcSizeLimit: 800
EOF
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