On 11 Sep 2017, at 11.24, Nagy, Attila bra@fsn.hu wrote: I use dovecot with a broken IMAP server (which doesn't properly implement command pipelining amongst others) as an imapc backend. Dovecot issues the above command sequence (SELECT and UID FETCH pipelined), which doesn't work with this server.
Therefore I'm requesting an imapc_features setting, IMAPC_FEATURE_NO_PIPELINING, which disables PIPELINING in dovecot imapc. Similarly to other workarounds, like IMAPC_FEATURE_FETCH_MSN_WORKAROUNDS, IMAPC_FEATURE_FETCH_FIX_BROKEN_MAILS et al.
Dovecot IMAPC should not pipeline unless remote advertises pipelining support in CAPABILITY response. Are you saying that you have imap server which advertses support for it but then does not support it after all?
Sami