Frage zum Verhalten von Address-Verify

[Andre Tann]

Moin,

in meinen Logs habe ich gerade das hier gesehen:

Mar 11 10:05:10 head01 postfix_port_25/smtpd[4917]: NOQUEUE: reject: 
RCPT from m32-11.eu.mailgun.net[141.193.32.11]: 550 5.1.1 
<r8fzoz at XXX.net>: Recipient address rejected: undeliverable address: 
Unknown User.; from=<bounce+b180db.183f-... at sender.domain> 
to=<r8fzoz at XXX.net> proto=ESMTP helo=<m32-11.eu.mailgun.net>

Mar 11 10:05:10 head01 postfix/smtp[4921]: 2EFD63E8F5: 
to=<r8fzoz at XXX.net>, relay=...[...]:25, delay=0.3, 
delays=0.01/0.02/0.23/0.04, dsn=2.1.5, status=deliverable (250 2.1.5 Ok)


Diese Zeilen stehen in dieser Reihenfolge direkt hintereinander im Log. 
Die Adresse r8fzoz at XXX.net gibt es, und das auch schon länger.

Wieso lehnt address-verify zunächst ab, und prüft direkt anschließend, 
obs die Adresse gibt?
Bis jetzt ist mir nicht aufgefallen, daß address-verify nicht ordentlich 
funktionieren würde. Aber das hier hat mich stutzig gemacht.

Hier noch die Config:

# postconf | grep address.verify
address_verify_cache_cleanup_interval = 12h
address_verify_default_transport = $default_transport
address_verify_local_transport = $local_transport
address_verify_map = btree:$data_directory/verify_cache
address_verify_negative_cache = yes
address_verify_negative_expire_time = 3d
address_verify_negative_refresh_time = 3h
address_verify_pending_request_limit = 5000
address_verify_poll_count = ${stress?{1}:{3}}
address_verify_poll_delay = 3s
address_verify_positive_expire_time = 31d
address_verify_positive_refresh_time = 7d
address_verify_relay_transport = $relay_transport
address_verify_relayhost = $relayhost
address_verify_sender = address-verify at alphasrv.net
address_verify_sender_dependent_default_transport_maps = 
$sender_dependent_default_transport_maps
address_verify_sender_dependent_relayhost_maps = 
$sender_dependent_relayhost_maps
address_verify_sender_ttl = 0s
address_verify_service_name = verify
address_verify_transport_maps = $transport_maps
address_verify_virtual_transport = $virtual_transport
lmtp_address_verify_target = rcpt
-- 
Andre Tann