IMAP Email returnes header field names twice

[vco1]

Bug Description

As of n8n version 1.79.3 the Imap Email node returns header filed names twice. Like this:

"headers": {
"return-path": "Return-path: <[email protected]>",

To Reproduce

1. Add an IMAP Email node.
2. Run it.
3. Look at output.

Expected behavior

"headers": {
"return-path": "[email protected]",

### Operating System

Debian

### n8n Version

1.79.3

### Node.js Version

As in latest Docker container

### Database

SQLite (default)

### Execution mode

main (default)

[Joffcom]

Hey @vco1,

We have created an internal ticket to look into this which we will be tracking as "GHC-943"

[Joffcom]

Hey @vco1,

You mentioned "as of 1.79.3" does this mean it was ok in previous versions and if so which version did you upgrade from?

[vco1]

It was definitely ok in the previous version(s) that I used. I don't exactly know which one that was, but it was the previous 'latest' version from the docker hub (1.79.2?).
The new behavior broke a check on the from address in my workflow. So I'm confident this has been changed.

[Joffcom]

Hey @vco1,

1.79.2 would have been latest but so would 1.78.x do you know when you did the previous upgrade?

[vco1]

I tested with multiple older versions. And it turned out this issue isn't caused by the n8n version. As it seems the output is dependent on the value in the "Format" field.
If format is set to "Simple", the headers are shown without the fieldnames repeated. Like this:
"from": "Amazon Web Services <[email protected]>",
When the format is set to "Resolved" the output changes to:
"from": "From: Amazon Web Services <[email protected]>",.
Sorry for the confusion.

[Joffcom]

Hey @vco1,

No problem at all, I will get this moved over to be looked at in more detail.