Problema invio posta con thunderbird

Salve,
da qualche giorno ho problemi nell’invio della posta con thunderbird.
Nello specifico compareil messaggio:
non è stato possibile inviare il messaggio perchè la connessione smtp e scaduta. se disabilito temporaneament Avast, il messaggio viene inviato

Grazie per l’attenzione

Please post English here, else use the forum section for your language.
https://forum.avast.com/index.php?board=21.0

Hello,
since some days I have problems sending mail with thunderbird.
Specifically, the message appears:
it was not possible to send the message because the smtp connection has expired. if you disable Avast temporarily, the message is sent

Thanks for the attention

  • Which Avast…? (Free/Pro/IS/Premier)
  • Which version…?
  • OS…? (32/64 Bit…? - which SP/Build…?)
  • Other security related software installed…?
  • Which AV(s) did you use before Avast…?
  • Which version of Thunderbird…?