What Is Causing This Error?
SMTP Error 447 can occur when an email exceeds the recipient limit set by the mail server. Email clients and servers often cap the number of recipients that can be included in the “To,” “CC,” and “BCC” fields of an email. Exceeding this limit can lead to an error, as the server is unable to process an email directed to too many recipients at once.
Resolving the Error – Solution
To avoid SMTP Error 447, familiarize yourself with your SMTP server’s recipient limits and ensure your emails comply with these guidelines. For instance, if your server permits only 30 recipients per email, ensure to include no more than this number across the “To,” “CC,” and “BCC” fields. If you need to communicate with more individuals, divide your recipient list into smaller groups and dispatch your message in multiple batches, adhering to the server’s limits for each send-out.
That’s it! Now you know the common causes of SMTP Error 447 and how to resolve it.
If you’d like to learn how to troubleshoot other common errors, check out the following docs: