First noted in May 2026
Bulk emailing via SMTP is being retired in 2026 before the end of year depreciation by Microsoft. If affected it will give a 1507 error code. We are told that not all staff are affected and for those that are they can request an exemption to the end of the year (there is a department knowledge base article on this process KBA0038690).
We are also in touch with the System Maintenance team and hope to have a new OAuth 2.0 email method released soon
Our apologies for any inconvenience and please let us know if we can assist further at this point.
