Of course, but whenever I force the message using postqueue -i the message was 
delivered nicely. Is there a way to see in the log when postfix tries to send 
to sendgird, which user and pass are called? I think maybe the user are wrong 
when they try to send in the queue, but when the message is forced it's 
delivered.

Thanks for all !

________________________________
De: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> em nome 
de Wietse Venema <wie...@porcupine.org>
Enviado: quarta-feira, 19 de dezembro de 2018 15:40
Para: Postfix users
Assunto: Re: Sender-Dependent SASL

Luis Miguel Flores dos Santos:
[ Charset ISO-8859-1 converted... ]
> Hi I'm using Sender-Dependent SASL authentication and sending to sendgrid but 
> afters a few days we have this errors for all clients:
>
> Dec 19 14:35:44 UBMSASENDWEB01 postfix/error[16038]: 4631114A2E3: 
> to=<daryoorl...@hotmail.com>, relay=none, delay=579, delays=569/9.3/0/0.06, 
> dsn=4.0.0, status=deferred (delivery temporarily suspended: SASL 
> authentication failed; server smtp.sendgrid.net[167.89.123.53] said: 451 
> Authentication failed: Maximum credits exceeded)

The *sendgrid server* says:

    451 Authentication failed: Maximum credits exceeded

For more info, I suggest the sendgrid website.

        Wietse

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