451 try again later
550 spf
550 5.7.0 message considered as spam
552 4.2.2 mailbox full
554 5.1.0 sender denied
554 too many hops
account has reached the allocation limit
blocked for abuse
blocked by spf
blocked using barracuda reputation
comcast blocked for spam
could not load drd for domain
delivery is delayed to these recipients or groups
delivery status notification (delay)
delivery status notification (success)
delivery temporarily suspended
delivery to the following recipients has been delayed
earthlink.net/block
exceeded their disk space limit for email
has been postponed due to a full mailbox
has failed due to a full mailbox
hop count exceeded
inbox is full
is not accepting mail from this sender
is over quota
mailbox exceeds allowed size
mailbox for user is full
mailbox full (in reply to rcpt to command)
mailbox has exceeded the limit
mailbox is full
mailfolder is full
message identified as spam
message rejected as spam
message would exceed quota for
no relaying allowed
not enough disk quota
over quota
over the allowed quota
over the storage quota
over their quota
quota exceeded
quota violation
relay access denied
relaying denied
resolver.rst.authrequired
review our bulk email senders guidelines
spf unauthorized mail
storage allocation exceeded
support.google.com/mail/bin/answer.py?hl=en&answer=188131
temporarily blocked
the email account you are trying to reach is full
the following addresses had transient non-fatal errors
the size of this mailbox has exceeded the mailbox limit
this system is not configured to relay mail from
warning: message still undelivered
was considered unsolicited bulk e-mail
was identified as spam and has not been delivered
you do not need to resend your message
