Breadcum issue

Issue:
 Not able to view the breadcum/path of file in folder/library.

Resolution:
 The breadcum of a folder/library can be activated once we have master page as:
"default.master"

Sent email failed, but the email id is valid

Most of the time we have seen that the sent email failed. The reason for this issue is mailbox is full.
TO resolve this issue we need to archive huge number of emails in INBOX