UCM630X Series User Manual
Version 1.0.11.10
Possible reasons:
1. The recipient's mailbox username does not exist or is in a banned
state, please check whether the email recipient is the correct email
address.
2. The number of destination addresses sent by the sender exceeds the
maximum limit per day and is temporarily blacklisted. Please reduce the
sending frequency or try again the next day.
3. The sender's IP does not pass the SPF permission test of the sending
domain. Emails sent in MTA mode may return this error code even if
they are sent.
The sent email is too large or the email attachment type is prohibited
The sender and the email account are inconsistent, please configure the
sender as your email account correctly.
The email was identified as spam. Please reduce the sending frequency
or try again the next day
This indicates that there is no return code.
If the sending result is "deferred", the general reason is that the mail
service area is configured incorrectly. Please check whether the server
configuration is correct.
If the sending result is "bounced", the general reason is that the
receiving email address domain name is wrong, please check whether
the email recipient is the correct email address. If it is in MTA mode,
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