"MailExceptions: Não é possível enviar a mensagem "5.7.1 The message contains an unauthorized custom...

Please, may i use portuguese?

 I’m giving the message: " MailExceptions.ItemOperationException: Não é possível enviar a mensagem (Corpo da mensagem não aceito pela seguinte razão: The message contains an unauthorized custom from address because the associated account has been disabled or deleted. Please revalidate the custom from if you believe this to be in error. s9sm2927118yhp.39 - gsmtp "

Hi, are you using Aliases? What version of eM Client are you currently using?
Unfortunately this seems to be an issue connected to your account and not the application itself, what mail service provider are you using?

Thank you,
Paul.

Thanks for attention.  The error no longer occurs, without any interference. 

Hi again, ok, if you come across this or any other issue, let us know we’ll be happy to help.

Thank you,
Paul.