We have the application server ( CRM system web-based ) running on windows 2012 R2 which is deployed on premises behind the firewall. we have to configure CRM application to send mails to the customers through office365 email account hence network team has provided access only to smtp.office365.com and on port 587 and denied rest of the outbound or inbound access i,e no http or https access to this system.
1. The CRM application is not able to send mails when the http/https is disabled for this system. Through the CRM workflows we are able to send the mails out only when the http and https is allowed to this system at firewall .
2. we are not able to convince the network team as they say we allowed outbound smtp.office365.com and 587 the issue would be at application side, they are asking explanation on why http/ https required,
can you please help me to understand on what all ports or access to be enabled at firewall for this system/server in additional to smtp.office365.com and port 587 in case of INBOUND and OUTBOUND so that we can communicate to the network team please.