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diff --git a/docs/docs/administration/postfix.md b/docs/docs/administration/postfix.md
index 4fdaa03..0916dc4 100644
--- a/docs/docs/administration/postfix.md
+++ b/docs/docs/administration/postfix.md
@@ -1,79 +1,90 @@
# Postfix
Postfix has the following relevant queues:
* Active: Email that is going to be delivered
* Deferred: Email that failed to be delivered, but is being retried until delivery succeeds.
* Hold: Email that was place on hold is not automatically retried.
## Inspecting mail queues
The following will generate an overview of mails in the queues, grouped by sender:
```
kolabctl postfix mailq-count-senders
```
This can take a significant time (15min with > 50k messages).
To get a quick count:
```
kolabctl postfix find /var/spool/postfix/deferred/ -type f -print | wc -l
```
## Putting mails on hold by sender address
The following will move mails from a specific sender, that are currently in the active or deferred queue, to the hold queue.
```
kolabctl postfix mailq-put-on-hold $sender
```
To delete emails that are currently in the hold queue, by sender:
```
kolabctl postfix mailq-purge-hold-queue --from $sender --now
```
## Print queued emails
Print all queued emails, from all queues.
```
kolabctl postfix postqueue -p
```
## Delete emails from all queues by sender
To delete emails that are currently in any queue, by sender:
```
-kolabctl postfix bash -c "postqueue -p | grep $sender | grep -oE '^[0-9A-F]{12}' | xargs -i postsuper -d {}"
+kolabctl postfix bash -c "postqueue -p | grep $sender | grep -oE '^[0-9A-F]*' | postsuper -d -"
+```
+
+## Delete emails from hold queue by age
+
+To delete emails that are currently in the hold queue (older than 50 days in this example):
+
+```
+kolabctl postfix bash -c "find /var/spool/postfix/hold -type f -mtime +50 -printf '%f\n' | sed 's/[*!]\$//' | postsuper -d -"
```
## Delete all emails in a queue
To delete all emails that are currently in a queue:
```
postsuper -d ALL hold
```
## Release emails from the hold queue
To release all emails in the hold queue:
```
kolabctl postfix postsuper -H ALL
```
## Print a message by id
```
kolabctl postfix postcat -q $messageid
```
+!!! note
+ Exclude the the queue indicator from the message id, so strip the '!' from a message in the hold queue.
+
## Process the mailqueue immediately
```
kolabctl postfix postqueue -f
```

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