This type of SMTP relay is little complex but highly customizable and programmable and since you are connecting directly to MX server or Smart Host of Office365. There are lot of restrictions to identify and to ensure that you are not a Spammer.
This type of SMTP relay is little complex but highly customizable and programmable and since you are connecting directly to MX server or Smart Host of Office365. There are lot of restrictions to identify and to ensure that you are not a Spammer.