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Server Error in '/ecp' Application.<br />
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HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. &nbsp;Please review the following URL and make sure that it is spelled correctly. <br />
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I get the following error when I try to login into Exchange 2013. &nbsp;I logged in just fine last week. Not sure what changed in the meantime. &nbsp;At the same time a user who is getting and email with an attachment is being deleted after being in his inbox for a minute at most. &nbsp;Not sure if it is related.
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Server Error in '/ecp' Application.

HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly. 

I get the following error when I try to login into Exchange 2013.  I logged in just fine last week. Not sure what changed in the meantime.  At the same time a user who is getting and email with an attachment is being deleted after being in his inbox for a minute at most.  Not sure if it is related.

Cannot log into Exchange 2013 ECP.

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.