450 Requested mail action not taken: mailbox unavailable
When an SMTP mail server responds to an attempted email delivery with:
450 Requested mail action not taken: mailbox unavailable
This indicates that the specified email address is not currently accepting deliveries. This might be because they've received too much mail recently, because their mailbox is full or some other mail server policy reason.
The message has not been delivered, but you should retry the delivery at a later time.
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Also in this topic:
- 250 OK Response
- 552 Requested mail action aborted: exceeded storage allocation
- 550 Mailbox not found
- 454 4.7.0 Temporary authentication failure
- 530 5.7.0 Authentication required
- 535 Authentication credentials invalid
- 452 Too many recipients
- 452 Requested action not taken: insufficient system storage
- 451 Requested action aborted: local error in processing
- 421 Service not available, closing transmission channel
- 251 User not local; will forward
- 554 5.3.4 Message too big for system
