LDAP schema issue

[Leander Schäfer]

Hi

This is the current relevant part of my schema:

attributetype ( objectClassAccount:1.1
    NAME 'mailAddress'
    DESC 'The hosted mail addresses'
    EQUALITY caseIgnoreIA5Match
    SUBSTR caseIgnoreIA5SubstringsMatch
    SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} SINGLE-VALUE )


1. How can I achieve, that upper case will always and only be stored as 
lower case?
2. How do I achieve a validation check whether the value is actually a 
valid email addres - very simple: u...@domain.tld?


Thanks & Best regards
Leander