After much googling, it appears that one can use either exim or dovecot as the LDA - the trade offs are not clear.
It seems that the amount of mass mails all needing to get indexed at the same time would make dovecot as the LDA create a higher server peak, -- I think the inbox is only indexed in the case of exim as the LDA when users check their mail - thus spreading the load. On the other hand, I don't see where the advantage of using dovecot as the LDA is documented. It could be important for indexing, caching.
Karl Schmidt EMail Karl@xtronics.com Transtronics, Inc. WEB http://xtronics.com 3209 West 9th Street Ph (785) 841-3089 Lawrence, KS 66049 FAX (785) 841-0434
It’s no wonder that truth is stranger than fiction. Fiction has to make sense. Mark Twain