<div>
Attachment is missing it seems.<br />
<br />
Sudeep
</div>


<div>
<div class="content wysiwyg-content">
Hi. I work as a sysadmin and have worked with AD/Exchange for years. Today I am seeing a problem I have never seen before and it's quite infuriating. We created a user in AD and his associated domain login is fine. We set up a mailbox for his account, which I had to change the primary SMTP email address for. But we have to do that for all their new startes so this is nothing untoward. The problem I have is that the user can send email (test emails from his account to mine work fine). However, I cannot send him an email. Nobody can. The following message (attached) is bounced back - seemingly related to MessageLabs. when I check MessageLabs, it would appear that this user is configured to receive email.<br />
<br />
Pulling. My. Hair. Out.#<br />
<br />
Many thanks.
</div>
</div>


Hi. I work as a sysadmin and have worked with AD/Exchange for years. Today I am seeing a problem I have never seen before and it's quite infuriating. We created a user in AD and his associated domain login is fine. We set up a mailbox for his account, which I had to change the primary SMTP email address for. But we have to do that for all their new startes so this is nothing untoward. The problem I have is that the user can send email (test emails from his account to mine work fine). However, I cannot send him an email. Nobody can. The following message (attached) is bounced back - seemingly related to MessageLabs. when I check MessageLabs, it would appear that this user is configured to receive email.

Pulling. My. Hair. Out.#

Many thanks.

New Exchange user can send email but nor receive it

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

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Email Software

Internet / Email Software

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.