According to RFC 1893, section "3.3 Mailbox status" Mail box full should be temporary error, but Plesk returns permanent error. With applied fix from MU#27, when mailbox is full the following error is returned:
"5.7.1 Mailbox full"
According to RFC 1893:
================================
X.2.2 Mailbox full
The mailbox is full because the user has exceeded a
per-mailbox administrative quota or physical capacity. The
general semantics implies that the recipient can delete
messages to make more space available. This code should be
used as a persistent transient failure.
================================
4.X.X Persistent Transient Failure
A persistent transient failure is one in which the message as
sent is valid, but some temporary event prevents the successful
sending of the message. Sending in the future may be successful.
================================
So, it means that instead of
"571 5.7.1 Mailbox full"
the error message should be returned:
"450 4.2.2 Mailbox full"
But now it returns 421 instead of 422. It will be fixed in 11.1
"5.7.1 Mailbox full"
According to RFC 1893:
================================
X.2.2 Mailbox full
The mailbox is full because the user has exceeded a
per-mailbox administrative quota or physical capacity. The
general semantics implies that the recipient can delete
messages to make more space available. This code should be
used as a persistent transient failure.
================================
4.X.X Persistent Transient Failure
A persistent transient failure is one in which the message as
sent is valid, but some temporary event prevents the successful
sending of the message. Sending in the future may be successful.
================================
So, it means that instead of
"571 5.7.1 Mailbox full"
the error message should be returned:
"450 4.2.2 Mailbox full"
But now it returns 421 instead of 422. It will be fixed in 11.1