Hello Stefano,
is there an error message when you try to send your messgaes?
If so, could you copy both the error and the log from the Tools>Operations window?
What version of eM Client are you running and what mail account does this happen with?
Regards,
Olivia
yes, I paste you the screenshot.
E mail account from aruba, em client version 7, windows 10 homehttps://forum.emclient.com/emclient/topics/not-sending-e-mail-heavier-than-1-mb 
Hello Stefano,
I just see the connection issue, which could be caused by your firewall or antivirus software (you can try adding eM Client to exceptions in these).
The first error is not marked in the part of the log you took a screenshot of.
It would be much more useful if you copied the full log.
Click inside, Select all (Ctrl + A) and copy (Ctrl + C) and paste the log (Ctrl + V) after the error pops up.
Regards,
Olivia
hello Olivia,
thank you for yor advice, I deactivated my antivirus on eM clients and now it works…
i post the last log before the changing,
16:14:48 Stato in linea: cambiato in in linea a causa di NetworkAvailability 16:14:48 [email protected] [POP3] Connessione: A [email protected]
16:14:53 [email protected] [POP3] MailExceptions.ConnectionException: Errore durante la ricezione dall’account [email protected] : Il certificato remoto non è stato ritenuto valido dalla procedura di convalida.
16:14:53 in MailClient.Pop3.Pop3ReceiveCommand.Execute(WorkerStatus status)
16:14:53 in MailClient.Commands.Command.Process(WorkerStatus status)
16:14:57 [email protected] [POP3] Connessione: A [email protected]
16:15:00 [email protected] [POP3] MailExceptions.ConnectionException: Errore durante la ricezione dall’account [email protected] : Il certificato remoto non è stato ritenuto valido dalla procedura di convalida.
16:15:00 in MailClient.Pop3.Pop3ReceiveCommand.Execute(WorkerStatus status)
16:15:00 in MailClient.Commands.Command.Process(WorkerStatus status)
16:17:53 [email protected] [SMTP] Connessione: A [email protected]
16:18:00 [email protected] [SMTP] Connesso: A [email protected]
16:18:00 [email protected] [SMTP] Invio dei messaggi
16:19:37 [email protected] [SMTP] MailExceptions.SocketException: Invio dei messaggi fallito per il seguente motivo:
16:19:37 “Impossibile leggere dati dalla connessione del trasporto: Impossibile stabilire la connessione. Risposta non corretta della parte connessa dopo l’intervallo di tempo oppure mancata risposta dall’host collegato.”
16:19:37 in MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
16:19:37 in MailClient.Commands.Command.Process(WorkerStatus status)
16:19:46 [email protected] [SMTP] Connessione: A [email protected]
16:19:57 [email protected] [SMTP] Connesso: A [email protected]
16:19:57 [email protected] [SMTP] Invio dei messaggi
16:20:43 [email protected] [SMTP] MailExceptions.SocketException: Invio dei messaggi fallito per il seguente motivo:
16:20:43 “Impossibile scrivere dati sulla connessione di trasporto: Impossibile stabilire la connessione. Risposta non corretta della parte connessa dopo l’intervallo di tempo oppure mancata risposta dall’host collegato.”
16:20:43 in MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
16:20:43 in MailClient.Commands.Command.Process(WorkerStatus status)
16:20:43 [email protected] [POP3] Connessione: A [email protected]
16:21:04 [email protected] [POP3] MailExceptions.ConnectionException: Errore durante la ricezione dall’account [email protected] : Il certificato remoto non è stato ritenuto valido dalla procedura di convalida.
16:21:04 in MailClient.Pop3.Pop3ReceiveCommand.Execute(WorkerStatus status)
16:21:04 in MailClient.Commands.Command.Process(WorkerStatus status)
but now it looks it is working (I will be carefull with span!)
Stefano