dovecot-pigeonhole-plugin (sieve) not functional (on armhf only?)
As soon as a user logs in, dlopen() complaints with the following
Error relocating /usr/lib/dovecot/lib90_sieve_plugin.so: mail_deliver_get_return_address: symbol not found
As a result, the client cannot connect. It is irrespective of the client using sieve or not, in other words, as soon as this plugin is enabled, dovecot becomes useless because it cannot accept new IMAP connections.
I don’t know if this occurs on other platforms as well.
(from redmine: issue id 9921, created on 2019-01-26, closed on 2019-05-09)