Estoy teniendo un problema relacionado con gmail. En mi empresa tenemos dominio gmial para los correos corporativos por lo que el email para notificaciones (Daemon::SchedulerTaskWorker) está configurado con uno de ellos, pero no está funcionando de forma correcta ya que continúo recibiendo el siguiente mail cada cierto tiempo y se crear tickets con este error:
This is an automatically generated Delivery Status Notification
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipient has been delayed:
mailer-daemon@googlemail.com
Message will be retried for 2 more day(s)
Technical details of temporary failure:
Google tried to deliver your message, but it was rejected by the server for the recipient
domain googlemail.com by gmail-smtp-in.l.google.com. [2607:f8b0:400d:c04::1b].
The error that the other server returned was:
450-4.2.1 The user you are trying to contact is receiving mail at a rate that
450-4.2.1 prevents additional messages from being delivered. Please resend your
450-4.2.1 message at a later time. If the user is able to receive mail at that
450-4.2.1 time, your message will be delivered. For more information, please
450-4.2.1 visit
450 4.2.1 https://support.google.com/mail/answer/6592 g143si6226217qhc.45 - gsmtp
----- Original message -----
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X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20130820;
h=x-gm-message-state:mime-version:subject
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bh=5/wd0dTeByH+yLglP09RVRiO4jSngtSurvi47pgphGs=;
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X-Gm-Message-State:
AOPr4FUVLxqJ2YaSSLKWn7Rub60GguwHaftuEoMiOJ/fWuaJjiAgt9sdGshA6o1av1kXgT7G
X-Received: by 10.55.101.82 with SMTP id z79mr25878537qkb.105.1462904427410;
Tue, 10 May 2016 11:20:27 -0700 (PDT)
Return-Path: <ticket@akzio.cl>
Received: from Citizen.akzio.cl ([190.196.66.190])
by smtp.gmail.com with ESMTPSA id m129sm1497930qkb.22.2016.05.10.11.20.25
for <mailer-daemon@googlemail.com>
(version=TLSv1/SSLv3 cipher=OTHER);
Tue, 10 May 2016 11:20:25 -0700 (PDT)
MIME-Version: 1.0
Subject: [Ticket#0100078] OTRS - Nuevo ticket creado : Delivery Status
Notification (Failure)
X-Powered-BY: OTRS - Open Ticket Request System (http://otrs.org/)
X-Mailer: OTRS Mail Service (5.0.

Date: Tue, 10 May 2016 14:20:24 -0400
Precedence: bulk
X-Loop: yes
Auto-Submitted: auto-generated
Message-ID: <1462893624.183262.927988423.128.1@Citizen.akzio.cl>
To: Mail Delivery Subsystem <mailer-daemon@googlemail.com>
El correo configurado en el OTRS funciona sin problemas para abrir tickets y enviar notificaciones, es sólo este error que no he logrado resolver.
Agradezco mucho su ayuda,