Good afternoon guys. I quickly browsed the sbs 2003 and sbs 2008/2011 forums but could not see anything similar:
I have a exchange 2003 server, sending mail through smarthost. My client has an sbs 2011 server, exchange 2010. My mail from exchange 2003 comes back (retry time-out exceeded). They receive (to my knowledge email without problems otherwise. I have 3 other 2008/2011 servers who receive my mail with no problem!
No, when I send a test mail using telnet on my sbs 2003 server, the mail goes through.