Correo Electrónico - Error de MDaemon

Por favor quien me ayuda con este error que me da el MDaemon 10, los usuarios mandan correos y les rebotan y los correos se quedan en bandeja de remote queue:

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MDaemon Delivery Status Notification - http://www.altn.com/dsn
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The attached message had TEMPORARY non-fatal delivery errors.

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THIS IS A WARNING MESSAGE ONLY - YOU DO NOT NEED TO RESEND YOUR MESSAGE
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MDaemon is configured to automatically retry delivery at configured intervals. Subsequent attempts to deliver this message are pending.

Failed address: anairmap@infomed.sld.cu

--- Session Transcript ---
Tue 2013-09-03 10:06:42: Parsing message <xxxxxxxxxxxxxxxxxxxxxxxx\pd50000007248.msg>
Tue 2013-09-03 10:06:42: * From: raciel@rtvcomercial.co.cu Tue 2013-09-03 10:06:42: * To: anairmap@infomed.sld.cu Tue 2013-09-03 10:06:42: * Subject: RE: [***SPAM*** Score/Req: 06.2/5.0] RV: Luis silva por facebook Tue 2013-09-03 10:06:42: * Message-ID: <000001cea8ae$c7fd3880$57f7a980$@rtvcomercial.co.cu>
Tue 2013-09-03 10:06:42: Attempting SMTP connection to [infomed.sld.cu] Tue 2013-09-03 10:06:42: Resolving MX records for [infomed.sld.cu] (DNS Server: 192.168.1.1)...
Tue 2013-09-03 10:06:52: * DNS: 10 second wait for DNS response exceeded (attempt 1 of 3) Tue 2013-09-03 10:06:52: This message is 60 minutes old; it has 0 minutes left in this queue Tue 2013-09-03 10:06:52: Remote queue lifetime exceeded; message placed in retry queue
--- End Transcript ---

Hola,

Pruebe triplicar los tiempos para las consultas dns de 10 seg a 30seg por ejemplo, esto es en configurar ->servidor por defecto -> sesiones.