Limitations
There are several rate limitations and restrictions that you should be aware of when using the v3 Mail Send endpoint.
- The total size of your email, including attachments, must be less than 30MB.
- The total number of recipients must be no more than 1000. This includes all recipients defined within the
to,cc, andbccparameters, across each object that you include in thepersonalizationsarray. - The total length of custom arguments must be less than 10000 bytes.
- Unicode encoding is not supported for the
fromfield. - The
to.name,cc.name, andbcc.namepersonalizations cannot include either the;or,characters.
For more specific, parameter level requirements and limitations, please refer to the v3/mail/send documentation.
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