Today T-mobile SMTP server starts to validate sender domain for BIS accounts
We had a major software release to our ASP platform early this morning. The ASP services have been monitored closely by an internal Hobbit monitor. During the maintenance window or after, no alert emails ever reached our duty pager, a blackberry 7290 with a T-mobile BIS (Blackberry Internet Email) account. Other alert venues worked as usual. After checking around, I found that the culprit is tmo.blackberry.net, T-mobile’s SMTP server for its BIS accounts. Out of blue, it starts to validates sender domain this morning and rejects any email whose SENDER field fails the new validation. Also described below is how to fix it for Postfix. Read the rest of this entry »
