Hello Marshal,
Marshal Newrock, 18.09.2006 (d.m.y):
The mailboxes will be on another machine, accessed over NFS. I want to use the LDA for quota support, especially as it looks like it will update the usage in the database.
Well, I would use the MTA's quota features as the MTA can handle quota problems at SMTP time. Otherwise your MTA has accepted a message and passes it to the LDA. When the recipient's account is over quota, what will yiur server do with this mail? When already the MTA checks if the account is over quota, the sender gets a 4xx "Error", your server has no need to deal with a bounce, and the sender is well-informed.
Regards, Christian Schmidt
-- "Ich habe 85 Kilo überflüssiges Gewicht weggebracht!" "Mensch, wie hast Du denn das gemacht?" "Ich habe meinen Mann zum Teufel gejagt!"