452 Requested action not taken: insufficient system storage

The server does not have room to take the message right now. It is usually a full mailbox or too many recipients in one go.

Temporary: it may work if you retry

The server does not have room to take the message right now. It is usually a full mailbox or too many recipients in one go.

Usual causes

The recipient’s mailbox is full.
You sent to more recipients in one message or connection than the server allows.

What to do

Usually the fault of: recipient.

Common questions.

What does 452 mean?

The server does not have room to take the message right now. It is usually a full mailbox or too many recipients in one go.

Will retrying fix 452?

Often yes. It is a temporary failure, and mail systems retry for you. If it keeps failing for days, look at the causes listed above.

How do I fix 452?

Retry later. If the mailbox is full, the recipient has to free space. If you were sending to many recipients at once, send in smaller batches.

SendSend shows each message’s result, and the reason the receiving server gave. Free for 3,000 emails a month.