in logs
#Software: Microsoft Exchange Server
#Version: 15.0.0.0
#Log-type: SMTP Send Protocol Log
#Date: 2018-12-06T08:18:44.843Z
#Fields: date-time,connector-id,session-id,sequence-number,local-endpoint,remote-endpoint,event,data,context
2018-12-06T08:18:42.343Z,My company to Office 365,08D65B4DD9C4222D,0,,104.47.44.36:25,*,,attempting to connect
2018-12-06T08:18:42.452Z,My company to Office 365,08D65B4DD9C4222D,1,10.0.10.8:8324,104.47.44.36:25,+,,
2018-12-06T08:18:42.593Z,My company to Office 365,08D65B4DD9C4222D,2,10.0.10.8:8324,104.47.44.36:25,<,"220 SN1NAM04FT058.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Thu, 6 Dec 2018 08:18:42 +0000",
2018-12-06T08:18:42.593Z,My company to Office 365,08D65B4DD9C4222D,3,10.0.10.8:8324,104.47.44.36:25,>,EHLO autodiscover.boardmapsemail.com,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,4,10.0.10.8:8324,104.47.44.36:25,<,250-SN1NAM04FT058.mail.protection.outlook.com Hello [51.75.164.54],
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,5,10.0.10.8:8324,104.47.44.36:25,<,250-SIZE 157286400,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,6,10.0.10.8:8324,104.47.44.36:25,<,250-PIPELINING,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,7,10.0.10.8:8324,104.47.44.36:25,<,250-DSN,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,8,10.0.10.8:8324,104.47.44.36:25,<,250-ENHANCEDSTATUSCODES,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,9,10.0.10.8:8324,104.47.44.36:25,<,250-STARTTLS,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,10,10.0.10.8:8324,104.47.44.36:25,<,250-8BITMIME,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,11,10.0.10.8:8324,104.47.44.36:25,<,250-BINARYMIME,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,12,10.0.10.8:8324,104.47.44.36:25,<,250-CHUNKING,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,13,10.0.10.8:8324,104.47.44.36:25,<,250 SMTPUTF8,
2018-12-06T08:18:42.702Z,My company to Office 365,08D65B4DD9C4222D,14,10.0.10.8:8324,104.47.44.36:25,>,STARTTLS,
2018-12-06T08:18:42.812Z,My company to Office 365,08D65B4DD9C4222D,15,10.0.10.8:8324,104.47.44.36:25,<,220 2.0.0 SMTP server ready,
2018-12-06T08:18:42.812Z,My company to Office 365,08D65B4DD9C4222D,16,10.0.10.8:8324,104.47.44.36:25,*,,Sending certificate
2018-12-06T08:18:42.812Z,My company to Office 365,08D65B4DD9C4222D,17,10.0.10.8:8324,104.47.44.36:25,*,CN=mail.boardmapsemail.com,Certificate subject
2018-12-06T08:18:42.812Z,My company to Office 365,08D65B4DD9C4222D,18,10.0.10.8:8324,104.47.44.36:25,*,"CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US",Certificate issuer name
2018-12-06T08:18:42.812Z,My company to Office 365,08D65B4DD9C4222D,19,10.0.10.8:8324,104.47.44.36:25,*,04432E549106A0963C6527AA7ACEEB034A2D,Certificate serial number
2018-12-06T08:18:42.812Z,My company to Office 365,08D65B4DD9C4222D,20,10.0.10.8:8324,104.47.44.36:25,*,F8C693311568D928EDA1278E2206E0861BD8ACBB,Certificate thumbprint
2018-12-06T08:18:42.812Z,My company to Office 365,08D65B4DD9C4222D,21,10.0.10.8:8324,104.47.44.36:25,*,mail.boardmapsemail.com;autodiscover.boardmapsemail.com;dbs-ex01.corp.boardmapsemail.com;dbs-ex02.corp.boardmapsemail.com;owa.boardmapsemail.com,Certificate alternate names
2018-12-06T08:18:43.093Z,My company to Office 365,08D65B4DD9C4222D,22,10.0.10.8:8324,104.47.44.36:25,*,,Remote certificate
2018-12-06T08:18:43.093Z,My company to Office 365,08D65B4DD9C4222D,23,10.0.10.8:8324,104.47.44.36:25,*,"CN=mail.protection.outlook.com, O=Microsoft Corporation, L=Redmond, S=Washington, C=US",Certificate subject
2018-12-06T08:18:43.093Z,My company to Office 365,08D65B4DD9C4222D,24,10.0.10.8:8324,104.47.44.36:25,*,"CN=GlobalSign Organization Validation CA - SHA256 - G3, O=GlobalSign nv-sa, C=BE",Certificate issuer name
2018-12-06T08:18:43.093Z,My company to Office 365,08D65B4DD9C4222D,25,10.0.10.8:8324,104.47.44.36:25,*,5760C0769D1714309D2D95DE,Certificate serial number
2018-12-06T08:18:43.093Z,My company to Office 365,08D65B4DD9C4222D,26,10.0.10.8:8324,104.47.44.36:25,*,73B89750FA406F7D4F7E43A9355A9D271079E938,Certificate thumbprint
2018-12-06T08:18:43.093Z,My company to Office 365,08D65B4DD9C4222D,27,10.0.10.8:8324,104.47.44.36:25,*,mail.protection.outlook.com;*.mail.eo.outlook.com;*.mail.protection.outlook.com;mail.messaging.microsoft.com;outlook.com;*.olc.protection.outlook.com;*.pamx1.hotmail.com,Certificate alternate names
2018-12-06T08:18:43.093Z,My company to Office 365,08D65B4DD9C4222D,28,10.0.10.8:8324,104.47.44.36:25,*,,"TLS protocol SP_PROT_TLS1_2_CLIENT negotiation succeeded using bulk encryption algorithm CALG_AES_256 with strength 256 bits, MAC hash algorithm CALG_SHA_384 with strength 384 bits and key exchange algorithm CALG_ECDHE with strength 384 bits"
2018-12-06T08:18:43.093Z,My company to Office 365,08D65B4DD9C4222D,29,10.0.10.8:8324,104.47.44.36:25,*,,Received certificate
2018-12-06T08:18:43.093Z,My company to Office 365,08D65B4DD9C4222D,30,10.0.10.8:8324,104.47.44.36:25,*,73B89750FA406F7D4F7E43A9355A9D271079E938,Certificate thumbprint
2018-12-06T08:18:43.171Z,My company to Office 365,08D65B4DD9C4222D,31,10.0.10.8:8324,104.47.44.36:25,>,EHLO autodiscover.boardmapsemail.com,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,32,10.0.10.8:8324,104.47.44.36:25,<,250-SN1NAM04FT058.mail.protection.outlook.com Hello [51.75.164.54],
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,33,10.0.10.8:8324,104.47.44.36:25,<,250-SIZE 157286400,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,34,10.0.10.8:8324,104.47.44.36:25,<,250-PIPELINING,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,35,10.0.10.8:8324,104.47.44.36:25,<,250-DSN,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,36,10.0.10.8:8324,104.47.44.36:25,<,250-ENHANCEDSTATUSCODES,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,37,10.0.10.8:8324,104.47.44.36:25,<,250-8BITMIME,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,38,10.0.10.8:8324,104.47.44.36:25,<,250-BINARYMIME,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,39,10.0.10.8:8324,104.47.44.36:25,<,250-CHUNKING,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,40,10.0.10.8:8324,104.47.44.36:25,<,250 SMTPUTF8,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,41,10.0.10.8:8324,104.47.44.36:25,*,,sending message with RecordId 365072220172 and InternetMessageId <8c253ebefeb44f2a83f810ded8c10772@dbs-ex02.corp.boardmapsemail.com>
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,42,10.0.10.8:8324,104.47.44.36:25,>,MAIL FROM:<cage@boardmapsemail.com> SIZE=4176,
2018-12-06T08:18:43.280Z,My company to Office 365,08D65B4DD9C4222D,43,10.0.10.8:8324,104.47.44.36:25,>,RCPT TO:<dp@gmail.com>,
2018-12-06T08:18:43.390Z,My company to Office 365,08D65B4DD9C4222D,44,10.0.10.8:8324,104.47.44.36:25,<,250 2.1.0 Sender OK,
2018-12-06T08:18:43.562Z,My company to Office 365,08D65B4DD9C4222D,45,10.0.10.8:8324,104.47.44.36:25,<,550 5.7.64 TenantAttribution; Relay Access Denied [SN1NAM04FT058.eop-NAM04.prod.protection.outlook.com],
2018-12-06T08:18:44.093Z,My company to Office 365,08D65B4DD9C4222D,46,10.0.10.8:8324,104.47.44.36:25,>,QUIT,
2018-12-06T08:18:44.202Z,My company to Office 365,08D65B4DD9C4222D,47,10.0.10.8:8324,104.47.44.36:25,<,221 2.0.0 Service closing transmission channel,
2018-12-06T08:18:44.202Z,My company to Office 365,08D65B4DD9C4222D,48,10.0.10.8:8324,104.47.44.36:25,-,,Local