Found this in rspmd log: Code: 2020-08-29 06:26:09 #22564(normal) glib; rspamd_glib_printerr_function: ** ERROR:/release/rspamd-2.5/src/libserver/async_session.c:229:rspamd_session_remove_event_full: code should not be reached 2020-08-29 06:26:09 #22564(normal) rspamd_crash_sig_handler: caught fatal signal 6(Keskeytetty), pid: 22564, trace: 2020-08-29 06:26:09 #22564(normal) rspamd_print_crash: 0: 00007F1F1FC38FFF: gsignal()+0xcf After that e-mails worked only somewhat. Nothing I tried showed me part of rspamd was not running. Rebooting host restored service and now it works again.