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We are experiencing the following issue and is driving us crazy: some of our users (not all) cannot send new email but can receive email and reply to them just fine. They are using MS Outlook 2016 connected to the latest Smartermail 14.4 via EAS.
What is driving us crazy is the fact that these users can receive email and can reply to email, but cannot send new mail! SmarterMail does not show any problems in the logs concerning these and we really have no other idea where to look for a solution. This occurs both when sending mail to local users and also to remote ones. Our email server is properly configured and there are no delivery issues, we are not blacklisted anywhere, etc.
Clients connected via other protocols are not experiencing any such issues at all; it`s just with ActiveSync.
Did anybody else experience anything like this? Any ideas on how to solve this would be welcomed!