Hi, Dont know if this has been raised already or not, but while playing with 5.5.3 ive found a problem with aliases in mysql.
If you have an alias in the valias table that is forwarding to an email address, everything is fine, however if you use the directory path you get the error delivery 21: deferral: Aack,_child_crashed._(#4.3.0)/ and although it does deliver the message, it stays in the queue and continually redelivers it each retry. Shane