Mail queue

How delivery retries work

This Postfix’s policy, read once at panel start. There is no maximum attempt count — only time.

First retry5 minutes

Later retriesdoubling, cap 1 h 7 min

Kept in queue5 days

Thenbounced

Pending messages

Queue id	Age	From	To	Size
4C3A1E2F1A	18 min	billing@example.com	ada@example.net	12 KiB
4C3A1E3010	11 min	news@example.com	pat@slow.example	48 KiB
4C3A1E3102	4 min	billing@example.com	ada@example.net	9 KiB

4C3A1E2F1A18 minbilling@example.com → ada@example.net
4C3A1E301011 minnews@example.com → pat@slow.example
4C3A1E31024 minbilling@example.com → ada@example.net

postqueue -p -Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient------- 4C3A1E2F1A* 12288 Sat Aug 15 20:14:02 billing@example.com ada@example.net 4C3A1E3010 49152 Sat Aug 15 20:21:18 news@example.com pat@slow.example -- 3 Kbytes in 3 Requests.