Cannot send mails via IMAP but can receive mails

HI All
Having Exchange 2010 SP2 on standalone box on W2K8R2-std sp1
We enabled IMAP and POP3 for our user base who do not have Outlook or are facing issues with active sync.
mailbox gets configured however none of mails are sent via IMAP they remain stuck in user outbox only.
They can receive mails but can't send. we tried configuring same users on Outlook and activesync and it worked.
We were surprised with some mis-configuration at IMAP end but could't get to root of it. Any idea what could be an issue????
for imap testing we tried Zimbra 7.2.3 on windows 7 pro, Windows Mail app in windows 8.1. IMAP in windows phone 8
Have enabled IMAP and pop3 logging but couldn't interpret it.
Cheers VP

Hi vp89,
Based on my knowledge, POP3 and IMAP cannot be used to send messages.
E-mail applications that use POP3 and IMAP4 to send messages rely on the SMTP protocol to send messages.
The connector for receiving e-mail submissions from client applications that use POP3 or IMAP4 is created automatically on every Hub Transport server.
We need a Send Connector.
More details in the following articles:
Understanding POP3 and IMAP4
http://technet.microsoft.com/en-us/library/bb124107(v=exchg.141).aspx
Create an SMTP Send Connector
http://technet.microsoft.com/en-us/library/aa997285(v=exchg.141).aspx
Hope it is helpful
Thanks
Mavis
Mavis Huang
TechNet Community Support

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Cannot send mails via IMAP but can receive mails

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