Error while sending email to multiple recipients through Webmail

I have set email account with InfinityFree and using Webmail service to access it.
It is throwing error when I try to send an email to multiple recipients.
SMTP Error (452): Failed to add recipient “” (4.5.3 Error: too many recipients).
Kindly suggest how to fix this.

The error message looks self explanatory: too many recipients. It means the message has too many recipients. Please reduce the number of recipients and try to send the message again.

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