goog-mail.py is a useful script used for getting email addresses from Google search results. Its author is unknown, but the script is available in many different places online.

1. You will need to download the script from https://github.com/leebaird/discover/blob/master/mods/goog-mail.py (or any other place you found it)

wget https://raw.githubusercontent.com/leebaird/discover/master/mods/goog-mail.py
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┌──(backslash0㉿kali)-[~/MHN/Reconnaissance/OSINT]
└─$ wget https://raw.githubusercontent.com/leebaird/discover/master/mods/goog-mail.py                                                                                                                                                    1 ⨯
--2021-09-06 10:05:18--  https://raw.githubusercontent.com/leebaird/discover/master/mods/goog-mail.py
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 185.199.110.133, 185.199.108.133, 185.199.111.133, ...
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|185.199.110.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2103 (2.1K) [text/plain]
Saving to: ‘goog-mail.py’

goog-mail.py.1                                              100%[========================================================================================================================================>]   2.05K  --.-KB/s    in 0s      

2021-09-06 10:05:18 (41.9 MB/s) - ‘goog-mail.py’ saved [2103/2103]
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2. Run the script providing a domain_name

python2 goog-mail.py [domain_name]
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┌──(backslash0㉿kali)-[~/MHN/Reconnaissance/OSINT]
└─$ python2 goog-mail.py uk.ibm.com
ukclubom@uk.ibm.com
martyn.spink@uk.ibm.com
gfhelp@uk.ibm.com
iand_ferguson@uk.ibm.com
graham.butler@uk.ibm.com
laurence.carpanini@uk.ibm.com
Pensions@uk.ibm.com
Bennett@uk.ibm.com
ibm_crc@uk.ibm.com
brian.mcglone@uk.ibm.com
wakefim@uk.ibm.com
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3. Make sure the emails look valid

Another very good tool for this purpose is theHarvester.