Forum Discussion
Mail Sending Fails Randomly
Hi I'm facing an issue with Microsoft exchange online. I'm using exchange server for sending mails from my application at port 587 (TLS) While sending mails some mails sent successfully and few mai...
Are you using TLS 1.0 or 1.1? If so, then here's the answer https://techcommunity.microsoft.com/t5/exchange-team-blog/new-opt-in-endpoint-available-for-smtp-auth-clients-still/ba-p/2659652