Remote Server returned '550 5.3.4 ROUTING.SizeLimit; message size exceeds fixed maximum size for route'

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Our biggest client is getting this message "Remote Server returned '550 5.3.4 ROUTING.SizeLimit; message size exceeds fixed maximum size for route"  when sending us large attachments (.pdf court documents).  This has never happened before. How do I fix this?  It is hurting our business. We are using Roundcube as our email interface. 
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Marli0344

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Posted 7 months ago

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Drew N, Community Manager

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What size email attachment are they sending? Our system has always max'd out at a mail size of approximately 20mb. Usually that means the attachment would be 13-16MB, when you include the mail transport additions. If the attached documents contain images, it might be the quality of the images they are sending that is increasing the file size.

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