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ah ha. &nbsp;That was the solution. &nbsp;Strange how it occurred on several workstations at the same time.
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ah ha.  That was the solution.  Strange how it occurred on several workstations at the same time.

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Yesterday, several machines at one of our locations stopped sending emails. &nbsp;Outlook keeps saying &quot;sending 1 of n&quot; and will not successfully send. &nbsp;I set up an account in Outlook Express on the server, and it is able to send just fine. &nbsp;I have disabled anti-virus programs; Windows firewall is turned off; &nbsp;There aren't any other add-ins that would interfere.<br />
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BUT, if I telnet into the SMTP server and manually type in the commands, I am able to send a messages - even from the machines in question. &nbsp;Therefore, I know it's not an issue with the SMTP server.<br />
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Does anyone have any advice? &nbsp;Thank you.
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Yesterday, several machines at one of our locations stopped sending emails.  Outlook keeps saying "sending 1 of n" and will not successfully send.  I set up an account in Outlook Express on the server, and it is able to send just fine.  I have disabled anti-virus programs; Windows firewall is turned off;  There aren't any other add-ins that would interfere.

BUT, if I telnet into the SMTP server and manually type in the commands, I am able to send a messages - even from the machines in question.  Therefore, I know it's not an issue with the SMTP server.

Does anyone have any advice?  Thank you.

Sending mail in outlook fails, but telnet to SMTP server works

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

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.