When you send an email and receive a delivery failure message, there could be several reasons. We've listed the most common error messages below, along with suggested resolutions.

Select an error below to see more information.
Can't connect to remote server/message expired
Connection timed out
Email could not be delivered to members from the group
Errors that include "blocked" or "listed in" and references to sites like "spamcop," "dynablock," "blackhole," or "spamhaus"
Host unknown or Domain lookup failed
Mailbox full or Quota exceeded
Mailbox not found, Invalid mailbox, or User unknown
Mailbox unavailable
Message too large
No adequate servers
Out of memory
Resources temporarily unavailable
Undeliverable
Your message couldn't be delivered

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