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We have two schools. School 1 - A.com and School 2 - B.com<br />
<br />
School 1 has an onsite Exchange 2013 server which is part of a Hybrid Office365 setup. School 2 is an accepted domain on the Office 365 setup but it's MX record points straight to Microsoft.<br />
<br />
We have an MIS system with a connector using the Exchange server that can send out emails as anything i.e. AnyAddress@A.com <br />
<br />
School 2 is now using the same MIS system. If I send an email to a B.com address from an A.com address it works fine. If however I change the From address to a B.com email address as the sender the email doesn't arrive and must be being rejected by the Exchange server. I tried adding in B.com as an accepted domain but it still didn't work.<br />
<br />
Ideally we need School 2 - B.com to be able to send out email as themsevles to parents so that when the parents arrive the emails will end up back in their Office 365 accounts.<br />
<br />
Is this possible or will SPF stop this sort of thing dead as I guess we're basically spoofing?<br />
<br />
If it is possible what's the best way to achieve this without changing config records for Office 365, which as a Hybrid setup is complicated enough :)
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We have two schools. School 1 - A.com and School 2 - B.com

School 1 has an onsite Exchange 2013 server which is part of a Hybrid Office365 setup. School 2 is an accepted domain on the Office 365 setup but it's MX record points straight to Microsoft.

We have an MIS system with a connector using the Exchange server that can send out emails as anything i.e. AnyAddress@A.com 

School 2 is now using the same MIS system. If I send an email to a B.com address from an A.com address it works fine. If however I change the From address to a B.com email address as the sender the email doesn't arrive and must be being rejected by the Exchange server. I tried adding in B.com as an accepted domain but it still didn't work.

Ideally we need School 2 - B.com to be able to send out email as themsevles to parents so that when the parents arrive the emails will end up back in their Office 365 accounts.

Is this possible or will SPF stop this sort of thing dead as I guess we're basically spoofing?

If it is possible what's the best way to achieve this without changing config records for Office 365, which as a Hybrid setup is complicated enough :)

Is it possible to send an email from a webserver from another domain without changing the MX record that external domain?

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.