Friday, April 22, 2011

Yahoo emails stuck in Exchange 2010 queue, Error: "421 4.4.2 Connection dropped due to SocketError"

Trouble when sending large (its varying) emails to Yahoo email addresses, its failing with the above error message in mail queue. (Last Error)

Thursday, April 14, 2011

Block specific domain from sending emails to your domain Microsoft Exchange 2010

Enable Anti-Spam feature in Hub Transport

Open Exchange Management Shell
Go to C:\Program Files\Microsoft\Exchange Server\V14\Scripts

Run the following Command:

Restart MSExchangeTransport Service
Restart-Service MSExchangeTransport

FIXED: Outlook POP3 Server error: '550 5.7.1 Unable to relay'

If you are getting '550 5.7.1 Unable to relay' in outlook you can fix it by changing Authentication settings in internet(Default) receive connector.