# Merging message streams
**URL:** https://discourse.nodered.org/t/merging-message-streams/62870
**Category:** General
**Tags:** function-node
**Created:** [20 May 2022 00:23 UTC](https://discourse.nodered.org/t/merging-message-streams/62870 "2022-05-20T00:23:11Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@tfuchs1987](https://discourse.nodered.org/u/tfuchs1987)
#### Post date: [20 May 2022 00:23 UTC](https://discourse.nodered.org/t/merging-message-streams/62870/1 "2022-05-20T00:23:11Z")
Hi Node-REDers,
I want to download several email attachments and send them inside one email. Everything works so far.
I just want to ask you guys what the best solution would be to merge or provide several message streams to a single email function-node.
At this time I am sending as much messages with "node.send(msg);" as I provide mail attachments and I merge the messages with a join-node. The problem here is if the last attchments sends the msg.complete earlier than the first messages completes, because it's super lage and needs a bit longer to download, it is lost and does not get caught by the join-node.
You guys probably would do it in a smarter way. I am super happy about any advice and thanks in advance!
---
### Author:  [@tfuchs1987](https://discourse.nodered.org/u/tfuchs1987)
#### Post date: [20 May 2022 03:18 UTC](https://discourse.nodered.org/t/merging-message-streams/62870/2 "2022-05-20T03:18:17Z")
Ok the join-node needs to identify each message to be able to merge all messages in automatic mode. This even does not need a msg.complete. msg.parts.id and msg.topic just need to have a unique ID.
A simple example would be
```auto
//Send multiple messages and merge with a join-node
for (let i = 0 ; i<5; i++){
msg.topc = msg._msgid;
msg.parts = {
id: msg._msgid,
index: i,
count: 5,
}
node.send(msg)
}
```
Fixed my problem but still, if you guys have a better, smarter solution please feel free to share
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [3 June 2022 03:18 UTC](https://discourse.nodered.org/t/merging-message-streams/62870/3 "2022-06-03T03:18:52Z")
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