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I would be surprised if you had just one mail server in a Corporate environment.
Best guess (without knowing much about your environment) is that the SMTP front-end server was not overloaded and was...

First check with the unix mailq command to see if the mail is still queued on your server. If it isn't, then this is just a temporary overload on the SMTP email server upstream of your server. The...

One-liners are to impress people the power of UNIX.

Let me try to break them down into multi-line with comments so that you can appreciate the real power

awk '
# for every odd record number...

Hi Vijay, this is called parameter expansion (http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_02).

If you are sure that the error lines will always have an INFO at the end, you may use:

awk '/ERROR/,/INFO/{ if( $0 !~ /INFO/ )print }' infile