Outbound log /

[FIRING] disk usage above 90 % on db-2

alerts@example.orgnoc@example.orgdeferred

01

Message

Application
alerts
Accepted
2026-09-21 13:58:07
Status reported
2026-09-21 13:58:09
Queue id
4XcB7k2Jm9z1
Journal id
184220
02

History

  1. Accepted and queued — Postfix accepted the message over an authenticated submission and the journal-milter recorded it.
  2. Deferred, will be retried — the receiving server could not take the message yet. Postfix retries: first after 5 minutes, then with increasing gaps up to 1 hour 7 minutes, for up to 5 days.
  3. Still in the queue; the next attempt is Postfix's own, and after 5 days it is bounced.
03

Delivery log

Lines from mail.log with this queue id
13:58:07 postfix/smtpd[2114]: 4XcB7k2Jm9z1: client=unknown[198.51.100.7], sasl_username=alerts
13:58:07 postfix/cleanup[2120]: 4XcB7k2Jm9z1: message-id=<a81f0c@alertmanager>
13:58:07 postfix/qmgr[2061]: 4XcB7k2Jm9z1: from=<alerts@example.org>, size=2214, nrcpt=1 (queue active)
13:58:09 postfix/smtp[2123]: 4XcB7k2Jm9z1: to=<noc@example.org>, relay=mx1.example.org[192.0.2.10]:25, delay=1.9, status=deferred (host mx1.example.org said: 451 4.7.1 Greylisted, try again in 5 minutes)