How to check the version of the update pack of the Microsoft Exchange Server 2013?

A few weeks ago it happens very unusual error with the e-mails received by the Microsoft Exchange Server 2013. All e-mails received from one specific e-mail address, which belongs to one of our vendors, are completely garbled.

Every e-mail is composed of several parts and contains the XML code. One day, suddenly, all e-mails are converted to plain text and the attachments are missing. When this anomaly appears, it affected all users.


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Manual test for the POP3 connection

This post will explain the procedure for manual testing of the e-mail receiving process. This procedure is useful for system administrators or programmers to narrow down problems in an operation of their e-mail server.

We can reproduce entire POP3 e-mail exchange process with manual typing of all commands. We can use this procedure when we need to test proper work between an e-mail server and an e-mail client.

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How to manually send the e-mail

This post will explain procedure for manual testing of the e-mail sending process. When you’re in doubt does your e-mail server works correctly, you can follow this procedure and check functionality.

We can manually simulate the client-server connection with the e-mail server whenever we need to test a connection or troubleshoot an errors in the communication.

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SMTP service status messages

A SMTP service is a part of the e-mail server responsible to receiving and delivering for an e-mail messages. It communicating with an e-mail client about every action. We, as end-users, can see some of this messages.

The SMTP server and a client doesn’t need whole test. There fore, a SMTP server can just return numerical code for it’s action. In courtesy to the user, SMTP server will return also text message in every e-mail sent back.

You can see from time to time that some e-mail stuck in outgoing queue or that it can’t be delivered to recipient. Such e-mail is short and usually have some text like You e-mail sent to the some_user can not be delivered because of and then some number and short explanation.

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