Gmail notification stopped working

[natanaeltome]

I was able to use gmail for notifications (using a two-factor authenticated account + app-password) for a while, and the following format:
mailtos://smtp.gmail.com?to={email}@gmail.com&user={email}@gmail.com&pass={pass}

This stopped working yesterday (no changes on my end), and every time I try I get the following message:
SENDING - null
WARNING - Connection error while submitting email to smtp.gmail.com. Reason: [Errno 99] Cannot assign requested address

I tried creating a new app-password, and enabling POP/IMAP in my email, but nothing changed. Any other suggestions are greatly appreciated.

Currently using v0.45.7.3
OS: Windows 10
Browser: Firefox v. 120.0.1

Steps to reproduce the behavior:

1. Go to 'Setting'
2. Click on 'Notifications'
3. Inside "Notification URL List", write down the URL using Google
4. Click on "Send Test Notification" and check the debug log

As a side note, thanks for the app and support, it has been really helpful!

[natanaeltome]

Update: It started working again as of now, without any changes on my end.

[dgtlmoon]

thats gmail :) do you have a commercial support account with them?

[natanaeltome]

No, I am using a normal personal account for this, which is both sending and receiving these notifications.

[natanaeltome]

It went down again, so I will probably try with other email providers later on.