I’ve just discovered than compression can be applied on Dovecot mail storage. Truth is I used to run the delivery via Postfix. Now that I use OpenSMTPD and Dovecot LMTP to deliver the mail, those can be compressed for write (LMTP) and read (IMAP) process. Here’s how. For the record, those directions apply to OpenBSD 5.7 running dovecot-2.2.15p0, dovecot-ldap-2.2.15 and bzip2-1.0.6p1. Tell IMAP process to use...
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