MySQL Trigger problem with the email address (cause contains the @ sign)
I ran an experiment. I created the following sample data and used your stored procedure:

drop database vito;
create database vito;
use vito
create table users
(id int not null auto_increment,
email varchar(255) not null,
primary key (id));
create table prova
(id int not null auto_increment,
provaemail varchar(255) not null,
primary key (id));
DELIMITER $$
CREATE TRIGGER inserisciemail AFTER INSERT ON users FOR EACH ROW 
BEGIN 
    INSERT INTO prova (provaemail) 
    VALUES (NEW.email); 
END $$
DELIMITER ;
insert into users (email) values
('redwards@logicworks.net'),
('rolandoedwards@yahoo.com');
SELECT * FROM users;
SELECT * FROM prova;


Here is the result:

mysql&gt; drop database vito;
Query OK, 2 rows affected (0.07 sec)

mysql&gt; create database vito;
Query OK, 1 row affected (0.00 sec)

mysql&gt; use vito
Database changed
mysql&gt; create table users
    -&gt; (id int not null auto_increment,
    -&gt; email varchar(255) not null,
    -&gt; primary key (id));
Query OK, 0 rows affected (0.11 sec)

mysql&gt; create table prova
    -&gt; (id int not null auto_increment,
    -&gt; provaemail varchar(255) not null,
    -&gt; primary key (id));
Query OK, 0 rows affected (0.08 sec)

mysql&gt; DELIMITER $$
mysql&gt; CREATE TRIGGER inserisciemail AFTER INSERT ON users FOR EACH ROW
    -&gt; BEGIN
    -&gt;     INSERT INTO prova (provaemail)
    -&gt;     VALUES (NEW.email);
    -&gt; END $$
Query OK, 0 rows affected (0.09 sec)

mysql&gt; DELIMITER ;
mysql&gt; insert into users (email) values
    -&gt; ('redwards@logicworks.net'),
    -&gt; ('rolandoedwards@yahoo.com');
Query OK, 2 rows affected (0.07 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql&gt; SELECT * FROM users;
+----+--------------------------+
| id | email                    |
+----+--------------------------+
|  1 | redwards@logicworks.net  |
|  2 | rolandoedwards@yahoo.com |
+----+--------------------------+
2 rows in set (0.00 sec)

mysql&gt; SELECT * FROM prova;
+----+--------------------------+
| id | provaemail               |
+----+--------------------------+
|  1 | redwards@logicworks.net  |
|  2 | rolandoedwards@yahoo.com |
+----+--------------------------+
2 rows in set (0.00 sec)

mysql&gt;


Looks like the trigger works fine to me.

Rhetorical questions:


Is the version of MySQL you are using source compiled or RPM/YUM installed ???
Should you upgrade to the latest version of MySQL ???