Section 5.5 of RFC3501 discusses the ability of IMAP servers to receive and execute multiple commands asynchronously on a single IMAP connection, not necessarily responding in the same order the commands were received: http://tools.ietf.org/html/rfc3501#section-5.5 Does Dovecot take advantage of this ability, or does it simply queue up the commands and execute them synchronously in order? -- Mike Cardwell - Perl/Java/Web developer, Linux admin, Email admin Read my tech Blog - https://secure.grepular.com/ Follow me on Twitter - http://twitter.com/mickeyc Hire me - http://cardwellit.com/ http://uk.linkedin.com/in/mikecardwell