SBS Exchange 2003 sends outgoing mail, but suddenly stopped receiving mail
Posted on 2010-01-05
Exchange Server 2003, under Small Business Server environment, has been working fine since installation 7 months ago. Our inside configuration has not changed since installation. All of a sudden, incoming mail gets bounced back to outside senders, and some outgoing mail is successfully sent and some isn't. From one client ws I sent an email to my external address and it was received. My reply (via smart phone) from external address was not received by the sending client. From another client ws, I sent to same external address and it was not received by my external address. GFI Mail Essentials filters incoming mail. Our IP address is not on any black list and as far as I can tell, we're not an open relay. The bounce back return message is something like "I've tried to send this email for 1.x days and I'm tired of trying." No error codes, per se. I'm thinking I need to check with ISP about possible DNS changes, and verify mx records, but beyond that - I need some expert guidance. If you have some ideas, please let me know. Client is desparate.