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Have you checked your message ques on the server?
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Have you checked your message ques on the server?

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I saw the incident today there are no messages in queue, BTW how long messages are there in queue viewer<br />
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and these mailboxes are in o365
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I saw the incident today there are no messages in queue, BTW how long messages are there in queue viewer

and these mailboxes are in o365

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Messages only sit in the Queue until they are sent, so from the time the server receives them until it manages to pass them onto the destination. You normally see large queues when users are sending mail merges and/or if the server its self has issue resolving domain names and/or forwarding to a designated smart host.
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Messages only sit in the Queue until they are sent, so from the time the server receives them until it manages to pass them onto the destination. You normally see large queues when users are sending mail merges and/or if the server its self has issue resolving domain names and/or forwarding to a designated smart host.

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We have serious problem with mails . Users are sending mails, but they just disappear. They are not even leaving trace in &quot;sent&quot;-items. Mostly sales people are reporting that customers are not receiving mails they have sent.
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We have serious problem with mails . Users are sending mails, but they just disappear. They are not even leaving trace in "sent"-items. Mostly sales people are reporting that customers are not receiving mails they have sent.

exchange 2010

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.