Hey Joseph!

Thanks for testing.

I couldn't recreate this with 2.1.16. Also, my version of "doveadm search" does not accept missing header patterns. Is this corroborated by dumping out the header with this same search query?

doveadm fetch -u exampleuser hdr SUBJECT Silvester
HEADER Return-Path someuser at example.com

Yes, it's same phenomenon when dumping with fetch. Of course you can only test this properly when you really have some mails with corresponding existing Header fields. (You can also try out other HEADER fields, like Reply-To, References, X-Spam-Score or whatever - just look at some mail headers of your mails and try it with existing fields.)

So E.g. When doing doveadm fetch -u exampleuser hdr SUBJECT Silvester HEADER Return-Path someuser@example.com

it initially outputs 13 headers (same as when using with SUBJECT Silvester only) , when piping it to "grep -i 'Return-Path'" it even found only 3 out of 13 headers containing a Return-Path at all, 2 of them different than someuser@example.com - so SAME behaviour as with search.

Maybe also relevant, as mail format I'm using sdbox (on a larger user base of 40.000 people).

-- (relevant part) of dovecot -n

# 2.2.5.5 (e5350245ad9b): /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-358.23.2.el6.x86_64 x86_64 Red Hat Enterprise Linux Server release 6.4 (Santiago) nfs auth_cache_size = 100 M auth_cache_ttl = 10 mins auth_master_user_separator = * auth_mechanisms = plain login auth_username_format = %Ln auth_verbose = yes disable_plaintext_auth = no import_environment = TZ DEBUG_OUTOFMEM DOVECOT_HOSTDOMAIN listen = * lock_method = dotlock mail_fsync = always mail_home = /mnt/nfs/vmails/%u mail_location = sdbox:/mnt/nfs/vmails/%u/mail:ALT=/mnt/archivnfs/vmails/%u/mail mail_plugins = " quota fts fts_lucene" mail_privileged_group = mail managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave mmap_disable = yes service imap-login { process_limit = 200 process_min_avail = 8 service_count = 0 vsz_limit = 512 M } service imap { client_limit = 1 process_limit = 10000 } service pop3-login { process_limit = 200 process_min_avail = 8 } service pop3 { process_limit = 10000 } verbose_proctitle = yes protocol lda { mail_plugins = " quota fts fts_lucene sieve" } protocol imap { imap_client_workarounds = tb-extra-mailbox-sep mail_max_userip_connections = 50 mail_plugins = " quota fts fts_lucene imap_quota" }

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