Can't send mail notification through gmail

[SR-G]

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I've found a bug and checked that ...

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• ... there are no open or closed issues that are related to my problem

Description

Hey.
Trying to activate the gmail notification, and nothing is working, despite many tries (port 587 versus 25, ssl true/false, insecureSkipVerify true/false, ...).
Is there a working configuration somewher ?? (the one found in another (closed) bug with port "25" is NOT working).

Right now my configuration is :

notif:
  mail:
    host: smtp.gmail.com
    port: 587
    ssl: true
    username: [email protected]
    password: XXXXXXXXXXXXXXXXXXX
    insecureSkipVerify: false
    from: [email protected]
    to:
      - [email protected]

which should be working (i'm using the exact same values with many other services, for example a working correspindg .msmtprc file is :

account        gmail
auth           plain
host           smtp.gmail.com
port           587
from           [email protected]
user           [email protected]
password       XXXXXXXXXXXXXXXX
tls_nocertcheck

Expected behaviour

No errors when GMAIL notifications are sent

Actual behaviour

DIUN is not able to send GMAIL notifications

Steps to reproduce

Configure diun with GMAIL settings

Diun version

4.28.0

Docker info

This is not "docker related"

Docker Compose config

No response

Logs

Errors are like (depending of what is true/false) :

Sun, 19 May 2024 12:58:22 CEST ERR Mail notification failed error="dial tcp 66.102.1.108:25: i/o timeout" image=ghcr.io/funkeyflo/ps5-mqtt/amd64:1.2.1

Sun, 19 May 2024 12:55:39 CEST ERR Mail notification failed error="gomail: could not send email 1: 421 4.3.0 Temporary System Problem. Try again later (10). For more information,\n4.3.0 go to\n4.3.0  https://support.google.com/a/answer/3221692 ffacd0b85a97d-3502b8a76e6sm26424236f8f.62 - gsmtp" image=ghcr.io/funkeyflo/ps5-mqtt/amd64:1.3.1

Sun, 19 May 2024 12:52:18 CEST ERR Mail notification failed error="tls: first record does not look like a TLS handshake" image=ghcr.io/home-assistant/home-assistant:2024.5.4

etc.

Additional info

No response

[crazy-max]

Your config seems correct but looking at 421 4.3.0 Temporary System Problem and https://support.google.com/a/answer/3221692 from your logs, the error code 421 says Service isn't available, try again later. Maybe there is an intermittent network issue on your host.