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GouthamFlag for India

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send mail using Office 365 SMTP relay through CRM system

Dear Experts

We are using offfice 365 SMTP relay to send mails to the external users through the CRM application, i,e option 3 on the following URL
https://support.office.com/en-us/article/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-office-365-69f58e99-c550-4274-ad18-c805d654b4c4 , this CRM system is allowed only to talk with <domain>.mail.protection.outlook.com on port 25 and 587 and rest of the access to the internet is blocked, not access for this CRM system to http/https to the external network.
1. we observed the CRM system workflow triggers the emails to the external network users only when the port 80 is opened for the CRM system at the gateway/firewall level,  we noticed the CRM system gets connected to internet and connects to crl.globalsign.com  and from here it is connecting to office365 smtp and emails are delivered.
2. when we disable access to external network i,e port 80 http blocked for CRM system at gateway/firewall then emails does not flow no packets flow found hence no mails are sent.
3. When only allowed CRM system can talk to crl.globalsign.com  then emails are getting triggered.
can you please help me understand how this office365 is working when it is configured to the CRM system. is it essential that CRM system to be allowed to talk to crl.globalsign.com . please suggest.
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Mahesh
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all you need to do is, DNS configured on CRM system should be able to resolve correct public IP of O365 MX you are pointing and then CRM system can establish connection

crl.globalsign.com is required so that globalsign certificate installed on CRM server should be able to reach to that URL to download CRL and validate own certificate against that CRL, its not related to your relay
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ASKER

thanks for the reply, if we allow access to the CRM system to the external site crl.globalsign.com and block rest all then emails are getting delivered via office 365 relay but if stop access for CRM system to reach URL crl.globalsign.com then emails are not getting delivered. for the emails to deliver from CRM system it should go through with smtp server with smtp port , please sugest
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Mahesh
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thanks for the reply, able to telnet <ourdomain>.mail.protection.outlook.com  with port 25 from CRM system also used telnet to test smtp connection gets established able to send and receive mails through commands MAIL FROM and RCPT TO we can see the packet flow but from CRM system emails are not going out with properly configured smtp details but the account is without authentication ( no password)
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