REGEX for parsing Received value in email headers (RFC822)
Example:
Received: from VI1PR0102CA0029.eurprd01.prod.exchangelabs.com
(2603:10a6:802::42) by VE1PR01MB5599.eurprd01.prod.exchangelabs.com
(2603:10a6:803:11f::30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2602.12; Thu, 9 Jan
...
Submitted by anonymous - a year ago