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Asked: 2026-05-24T05:25:43+00:00

i have an app that stores uploaded files in s3, once complete a mail

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i have an app that stores uploaded files in s3, once complete a mail is sent with the attached file. The app works fine when attachments are between 0-15 Mb in size. However when i attached something larger like 16 Mb it fails and returns the error:

Net::SMTPFatalError: 550 Could not send e-mail, max size of 20480000 bytes exceeded

1). Firstly i do not understand why it fails as, 16Mb < 20480000 bytes(+/-19 Mb)
2). How can i mail files larger than 19Mb

I am using heroku’s sendgrid addon, and rails 3 with amazon s3

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1 Answer

  1. Editorial Team

    Normally when you attach a binary file to a mail message it gets translated to an ASCII format, and the size grows with about 30% – in your situation that means the maximum file attachment can have somewhere between 15 and 16M.

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