Wondering how to overcome the error ‘SMTP error 431’? Then take a peek at this blog.

Here at Bobcares, we receive requests to fix SMTP errors and other similar hosting errors as part of our Server Management Services.

Today, we’ll see why this error occurs and also see how to fix it.

What causes SMTP error 431 to occur

This error actually seems to be misleading.

Generally, this 431 error refers to be “Not enough storage or out of memory” problem.

So we might think that this error is related to receiving/destination server running out of memory or they don’t have enough storage for delivery.
However, this error actually relates to the number of recipients the email message has. It suggests that the receiving server can not parse which of the recipients it is supposed to deliver the message.

For instance, the error message appears below.

SMTP status code – 431 – The recipient’s mail server is experiencing a Disk Full condition
(also called SMTP Error 4.3.1)

OR

SMTP Error 431: The recipient’s mail server is
experiencing a Disk Full error condition, or an Out of
Memory (too many file handles) error condition (Microsoft
Exchange)

How we tackle the error ‘SMTP error 431’

Now let us see the suggestions our Support Engineers provide to our customers to resolve this error message.

This error is mainly specific to having too many recipients. So try re-sending a new email message to the failed recipient. Make sure that it is the only recipient of that message.

Sending too many messages to a particular domain might create a problem. So try sending smaller batches of emails instead of sending bulk messages.

[Need any further assistance in fixing SMTP errors? – We’re available 24*7]

Conclusion

In short, this SMTP error occurs if you are having too many recipients while sending an email. Today, we saw the workaround for this error.