Please refer to following PDF guide to setup Exchange 365:
Company MX should be configured as:
10 postfix.server.acompany.com
20 exchange365.your.exchange.mx.record.goes.here
Please refer to following PDF guide to setup Exchange 365:
Company MX should be configured as:
10 postfix.server.acompany.com
20 exchange365.your.exchange.mx.record.goes.here