linux - using awk and sed find using lines in a file based on a field value from awk -

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I use a postfix relay to send my mail server to our email server.
I have to get the serial number value before some users receive an email address using the value of the e-mail they are sending. Examples of entry and entry from below are I think you have to use a combination of awk and sed.

Sender Line 

  4 November 14:29:53 Server Postfix / qmgr [2089]: 42UE78JD7JE: to = & lt; Sender@domain.som> ;, size = 1182, nrcpt = 1 (Qi active)

receiver line 

  4 November 14: 29: 54 server postfix / SMTP [10544]: 42UE78JD7JE: Too = & lt; User@gmail.com>, relay = gmail-smtp-in.l.google.com [74.125.22.27]: 25, delay = 1, delay = 0.02 / 0

In the above example, I want to remove 42UE78JD7JE from the first row and then find it in the second row. I'm thinking that you will use awk to get serial number values ​​in line with 'sender@domain.com', then use that value to search for lines with that value and use 'to =' 

  awk '$ 7 ~ / ^ to = / {$ 6] = $ 7} Print from [key] to [key] from [key]} 'file [/ code>]  (in the key) if ~ / ^ to = / {to [$ 6] = $ 7} Pre>  to = & lt; Sender@domain.som> ;, to = & lt; User@gmail.com>,

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