We recently installed an Exchange 2010 Server and we are having some problems sending emails to certain domains. Email is stuck in the queue with 421 4.2.2 Connection dropped due to SocketError.
Any Suggestion? The below is the message when using telnet command:
EHLO etla.com.cn 250-aa6061.com Hello [22.214.171.124] 250-TURN 250-SIZE 15360000 250-ETRN 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-8bitmime 250-BINARYMIME 250-CHUNKING 250-VRFY 250-X-EXPS GSSAPI NTLM LOGIN 250-X-EXPS=LOGIN 250-AUTH GSSAPI NTLM LOGIN 250-AUTH=LOGIN 250-X-LINK2STATE 250-XEXCH50 250 OK MAIL FROM:email@example.com 250 2.1.0 firstname.lastname@example.org....Sender OK RCPT TO:email@example.com NOTIFY=success,failure **550 5.7.1 Your email messages have been blocked by the recipient OR by Trend Mic ro Email Reputation Service. Contact the recipient or his/her administrator usin g alternate means to resolve the issue.**