Fastmail: Failed to send test notification.

[akovia]

I don't want to post a bug, but I can't get this to work.
Since it uses a built-in template, this couldn't be easier to set up. I'm using this in Yamtrack if that matters.

I've added an app password with SMTP access. (twice)
I'm using my account name with one of the supported domains from your list, with the app password I generated.

mailto://{my-username}:{my-app-pw}@approved-fastamail-domain.com

I've bypassed the CSP errors with an extension, and the only other message on chrome tools is a warning:
Manifest: property 'shortcuts' contains more than 10 valid elements, only the first 10 are parsed.

Any tips on other things to try?
Thanks!

[caronc]

The error message is not from Apprise... Unfortunately you haven't given me a lot to go off of 🙂 . Do you have any error messages to work with from Apprise that may help use?

You can make sure your URL is assembled correctly here: https://appriseit.com/url-builder/?schema=mailto

The only other thing I can suggest is that you get the Apprise:

pip install apprise

Then you can make sure the URL you're building works... or use the Apprise API (see https://appriseit.com/api/deployment/) which gives you a nice web page to build/costruct your Apprise URLs with (self hosted). It casn also act as a relay for you (always supportin the latest version of Apprise where as Yamtrack may or may not... Just some ideas anyway; but i'll need more info to go off of to be able to assist you.

[akovia]

@caronc
Thanks for the quick reply.
Seems apprise was already installed on my system. Must have been a dependency for something else. (Arch)

I was getting a Incorrect username, password or access token error, but couldn't understand why. I already have 7 fastmail app passwords I use for many other services and never experienced this before. I did a test from my local hosted immich server and the email sent without an issue.

$ apprise -D -t "Test" -b "Fastmail notification test" "mailto://{my-username}:{my-app-pw}@approved-fastamail-domain.com"
2026-07-02 07:45:22,250 - DEBUG - Could not load translation path: /usr/lib/python3.14/site-packages/apprise/i18n/en
2026-07-02 07:45:22,463 - DEBUG - 137 Notification Plugin(s) and 191 Schema(s) loaded in 0.2092s
2026-07-02 07:45:22,463 - INFO - Applying Fast Mail Extended Addresses Defaults
2026-07-02 07:45:22,464 - DEBUG - Loaded E-Mail URL: mailtos://%my-username%7D:****@approved-fastamail-domain.com/?pgp=no&format=html&overflow=upstream&cto=15&smtp=smtp.fastmail.com&mode=ssl
2026-07-02 07:45:22,464 - DEBUG - Connecting to remote SMTP server...
2026-07-02 07:45:22,464 - DEBUG - Securing connection with SSL...
2026-07-02 07:45:24,199 - DEBUG - Applying user credentials...
2026-07-02 07:45:31,234 - WARNING - Connection error while submitting email to "smtp.fastmail.com"
2026-07-02 07:45:31,235 - DEBUG - Socket Exception: (535, b'5.7.0 Incorrect username, password or access token.')

I decided to try the manual mail server settings to see if something was wrong with the fastmail template.
$ apprise -D -t "Test" -b "Fastmail notification test" "mailtos://my-username:my-app-pw@approved-fastamail-domain.com:587?smtp=smtp.fastmail.com"

Same error.

Was just about to quit when I read this blurb:

Some mail servers will require your {user} to be your full email address. In these cases, you'll need to specify your username in the url as an attribute like so:

mailto://{password}@{domain}:{port}?user={user}

This doesn't work with the fastmail template with the full user name before the password, but I finally had success once I figured out how to add it to the end to my manual server command. Tried a space and a question mark, but then the & was the ticket.

$ apprise -D -t "Test" -b "Fastmail notification test" "mailtos://my-app-pw@fastmail-domian.com:587?smtp=smtp.fastmail.com&user=my-full-email-address"

Maybe you can point out something I did wrong, but it seems like the fastmail templates don't work. At least with one of the alternate domains. Either way, I'm glad this is now working.

Thanks for the clues to help me troubleshoot it.

Cheers!