Hi, When/how does postfix prevent duplicate deliveries when delivering to an alias and explicitly also to the alias result? For example all@domain + Cc to one of the members of that alias. I have found parameters "duplicate_filter_limit" and "enable_original_recipient" that mention it, but I don't understand how exactly it works.
I have an older mailserver where this works (no duplicate deliveries, otherwise someone would complain). I am using virtual users with default virtual delivery. I also have another mail server also with the same type of virtual users (same database schema), but which was setup with Dovecot LDA as delivery agent. And there the deduplication doesn't work, I had to use dovecot-sieve's "duplicate" extension, which discards the duplicated email. Is it because for LDA I have destination_recipient_limit=1? Or maybe just because of using sender_bcc_maps and not related to LDA? I have setup sieve rule in the past according to https://serverfault.com/questions/112958/postfix-aliases-and-duplicate-e-mails-how-to-fix which mentions old faq.html on postfix web and some broken links to old mail list archives claiming the deduplication is not implemented. So what are the prerequisites for it to work? I am now planning to migrate the old server from courier to dovecot + lda and want to know if I will need the sieve solution again or not... -- bye, Marki
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