Exchange 2010 - Outlook cannot connect to SMTP


I recently installed Exchange 2010 to one of my customers.
At first everything looks good, Autodiscover working fine, OWA working fine.
The problem is with POP3 and IMAP, because the incoming mail works perfect, but I cannot set up the outgoing server.

The settings are basic: Outgoing server requires authentication, when I'm trying to test account settings, Outlook keeps asking me for user\pass and not accepting the credentials anyway.

Can you please assist me here?
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check for the certificate.

Make sure it's enabled for Imap/ Pop3 :)

If not, then : enable-exchangecertificate -thumbprint "ID" -services Pop,imap, smtp, iis

cloudbaseAuthor Commented:

thanks. The certificate is enabled for IMAP,POP and IIS.
if you check connection status, by pressing Ctrl + Right-click on the Outlook systray icon, to where is it pointing at ?

Also is the certificate installed on the clients ? Is  the SPA enable ?

On the outgoing server options, check the "Use same as my incoming mail Server "


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cloudbaseAuthor Commented:
the connection is pointing to the casarray.

The certificate is installed on each CAS server for the imap, pop and iis services.

SPA not enables and "Use same as my incoming mail Server" was checked from the first place.

cloudbaseAuthor Commented:
it turns out to be the that SMTP needed certificate as well.
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