we have a single server environment, windows 2008 r2 with exchange 2010 standard. we have one customer from which we cannot receive their mail. they use exchange 2000. their administrator is saying that they are receiving a "temporary authentication failure" when they attempt to send mail to us.
we ran the exchange best practices analyzer. it came up with errors regarding our certificates. IE: The subject alternative name (SAN) of SSL certificate for https://mail.xyz.com/ews/exchange.asmx
does not appear to match the host address. Host address: mail.xys.com. Current SAN: DNS Name=nbn1, DNS Name=nbn1.xyz.com.
could this be the reason their e-mail is failing to reach us? we have a backup smtp server using linux off-site. our primary mx 10 points to our exchange 2010 server our backup using our secondary mx 50. the backup smtp server receives their e-mail without a problem after attempting to deliver to our primary.
any help is greatly appreciated.