Quoted env variables don't work when containing comma about watchtower HOT 5 OPEN

Multiple recipients should work fine for shoutrrr. It might be something with the legacy notifications adapter that encodes the commas, perhaps?

Try using a shoutrrr URL directly instead:

WATCHTOWER_NOTIFICATION_URL: smtp://username:password@host:port/?from=fromAddress&to=recipient1,recipient2

(you can see what the adapter transforms your notification configuration to if you run watchtower with --trace)

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Setting this environment variable fixed the issue so I could find the issue on my side.

I used the following compose notation:

version: "3"
services:
  watchtower:
    environment:
      - WATCHTOWER_MONITOR_ONLY=true
      - WATCHTOWER_NOTIFICATIONS=email
      - WATCHTOWER_NOTIFICATIONS_LEVEL=info
      - WATCHTOWER_NO_STARTUP_MESSAGE=true
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER=mail
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=25
      - WATCHTOWER_NOTIFICATION_EMAIL_DELAY=2
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_TLS_SKIP_VERIFY=true
      - WATCHTOWER_NOTIFICATION_EMAIL_FROM="[email protected]"
      - WATCHTOWER_NOTIFICATION_EMAIL_TO="[email protected],[email protected]"
      - WATCHTOWER_LOG_LEVEL=trace
[...]

Removing the quotes fixed the issue. Quotes are fine for one recipient but with a comma the mentioned error is printed.
Thank you for the support @piksel

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Interesting! So this was caused by docker compose's environment parsing... Or perhaps it's due to our attempts at cleaning extra quotes that split the input into addresses before removing quotes...

I'll reopen this until it's properly investigated.

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I just want to add another thing. This behavior seems to depend on the compose notation. I switched environment definition from a list to a map and then it is possible to use quotes.

The following two definitions are working:

• List

  environment:
        - [email protected],[email protected]
  

• Map

  environment:
     WATCHTOWER_NOTIFICATION_EMAIL_TO: "[email protected],[email protected]"
  

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