Portal Home > Knowledgebase > Google Message Security > What are the file size limits for attachments?
For Attachment Manager, the message size filter’s maximum limit is 300 MB. The default is 200 MB. This policy applies to all traffic, including mail which is not filtered for spam and viruses. When an attachment exceeds the size limit, the message is bounced, and the sender receives the SMTP error message, 552 Message too large - psmtp.
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