SMTP component no more working about core HOT 14 OPEN

the issue is not permanent here, too. sometimes it works after a reboot, sometimes not. sometimes the servic crashes even it was running after some hours.
I recognize the crash becuse i get a message that my automation cannot fint the notify service anymore.

in my case i am using a local exim mailserver (as a relay) without authentification. as already said, thos worked for years without any problems. there is no error log or any other log on the exim side. its just the ha smtp integration crashing :(

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smtp documentation
smtp source

from core.

Got the same issue.
SMTP Integration seems to be very unstable. A config-reload brings the service back to action....

Also i guess if the Network / Internet connection is broken for a while, Notify-SMTP-Integration is lost till HA Configuration is reloaded in Developer-Tools.

My Config:

notify:
  - name: "apple_mail_notification_customdomain_tld"
    platform: smtp
    sender: "[email protected]"
    recipient: "[email protected]"
    server: "smtp.mail.me.com"
    port: 587
    timeout: 5
    username: "[email protected]"
    password: 'blahblah-my-app-specifiy-password'
    encryption: "starttls"
    sender_name: "HomeAssistant"
    verify_ssl: false
    debug: true

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I have 2 almost identical "Send Mail" services. Since this week(maybe Core 2024.3.3?) only one of them ist working. I experimented a little and found the reason: The not-working Mail has an "Umlaut" "ö" in the Text. Deleted the "ö": SMTP is working, changed it back: not working.
Maybe that helps a little

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Oh okay, but you mean within the config or within for example the message or subject of the mail which should be sent? Im using a HTML-Formatted Mail content...

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The Umlaut was in the message.

• id: '16338861470'
  alias: Mail Garage Offen
  description: ''
  trigger:
  • platform: state
    entity_id:
    • binary_sensor.garagentor_input
      to: 'on'
      from: 'off'
      condition: []
      action:
  • service: notify.garoffen
    data:
    message: Das Garagentor wurde am {{now().strftime("%d.%m.%y um %H:%M:%S")}}
    Uhr geöffnet!
    title: Garage auf:{{now().strftime(" %d.%m. - %H:%M:%S")}}
    mode: single

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Okay, yeah, checked all my Mail Templates but there are no Umlauts used... So really strange.

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Did a test at my production instance running HA OS. The SMTP notification service just works fine for me. What mail provider are you having issues with? If it is a public provider I could may be do a test. No credentials needed.

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The issue is only happening sometimes (on my end).
So i had the issue twice till now: "Service is not available" after a config-reload the automation worked again... im not sure when this is happening.

Im using my iCloud+ Account with Custom-Domain for sending the Mails.

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can you share the host name of the SMTP server you are using, only if it is a public server?

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its not a public one..

notify:
  - name: "apple_mail_notification_customdomain_tld"
    platform: smtp
    sender: "[email protected]"
    recipient: "[email protected]"
    server: "smtp.mail.me.com"
    port: 587
    timeout: 5
    username: "[email protected]"
    password: 'blahblah-my-app-specifiy-password'
    encryption: "starttls"
    sender_name: "HomeAssistant"
    verify_ssl: false
    debug: true

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I think the smtp integration should be moved to use config flow. This enables to make the entry startup more robust. But the logging is not handled in an optimal way either.

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you mean to separate it into another .yaml file?

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No, but use a config entry, it will also allow it to be set up from the ui

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