>Anyone familiar with software which uses #@[] as the MAIL FROM argument?
Yes. >Is that some software's version of an empty bounce address? Sort of. In qmail, if a message with a null bounce address is undeliverable, the double-bounce message generated has an envelope address of #@[] and is typically addressed to a postmaster address. If a message with a #@[] address isn't deliverable, it logs the error and discards the message. This design is intended to produce useful bounce messages while avoiding bounce loops. It's been around since 1998 and seems to work pretty well. I'd suggest that deliver or discard is a reasonable thing to do with them, or maybe just discard them all since nearly all are due to spam blowback. R's, John _______________________________________________ mailop mailing list mailop@mailop.org http://chilli.nosignal.org/mailman/listinfo/mailop
