smtp does not work on office365

Heartbleed -service=smtp smtp.office365.com:587
2014/04/11 10:17:51 smtp.office365.com:587 - ERROR: Server does not support STARTTLS (503 5.5.2 Send hello first)

Start by reproducing the reported command against smtp.office365.com:587 and inspect the SMTP checking path to determine why the server's STARTTLS response is handled as unsupported. Compare the observed response with the checker's expected SMTP flow; done means the Office 365 endpoint is handled correctly without regressing other SMTP checks.

Written by the indexing model from the issue text.