CircleID

Hotmail Running Its Own SMTP Variation

Companies sensible to effective delivery of email to all free email services may have noticed problems with deliveries to Hotmail addresses. Despite the SMTP dialog ending with a successful "250" return code, recipients don't see the message. In their Guidelines, MSN require thorough compliance with IETF standards. However, it seems they have their own interpretation about provisions for Delivery Status Notifications, a.k.a. bounces, that servers must send after they have accepted responsibility for delivering the message... more»