[sqlite] UNIQUE ON CONFLICT IGNORE problem?

[Peter Pistorius]

CREATE TABLE mailLst 

(

mailId INTEGER PRIMARY KEY,

mailMID INTEGER UNIQUE ON CONFLICT IGNORE

mailDateBegin DATETIME,

mailDateEnd DATETIME, 

mailDateTime DATETIME, 

mailTo VARCHAR,

mailFrom VARCHAR, 

mailSize VARCHAR,

mailSpam VARCHAR,

mailStatus VARCHAR

);

 

I've created this table and am using a SQLITE.net wrapper, but the
mailMID isn't unique? What's going on?