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You need access to a mail server that will accept your SMTP traffic. <br />
<br />
Have you considered an Office 365 Business Essentials subscription? I believe you can get it for as little as $6 (one user for only one month.) It includes a business email server - your domain name and all that, in the cloud. Couldn't be easier. I decided to retire my company's local mail servers, which cost way too much to just maintain properly, not including the hardware, licenses, additional software (AV, anti-spam, etc.). Moved it all to Office 365. Got rid of a lot of headaches and saved a bunch of money!
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You need access to a mail server that will accept your SMTP traffic.

Have you considered an Office 365 Business Essentials subscription? I believe you can get it for as little as $6 (one user for only one month.) It includes a business email server - your domain name and all that, in the cloud. Couldn't be easier. I decided to retire my company's local mail servers, which cost way too much to just maintain properly, not including the hardware, licenses, additional software (AV, anti-spam, etc.). Moved it all to Office 365. Got rid of a lot of headaches and saved a bunch of money!

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Hi,<br />
<br />
We do not currently have network connectivity to an in house smtp relay server. &nbsp; &nbsp;Do I need to use an IIS Server for this or how can I do this to the safest relay server without using an in - house mail server for the short term:<br />
<br />
<a href="http://www.howtogeek.com/120011/stupid-geek-tricks-how-to-send-email-from-the-command-line-in-windows-without-extra-software/" rel="ugc">http://www.howtogeek.com/120011/stupid-geek-tricks-how-to-send-email-from-the-command-line-in-windows-without-extra-software/</a>
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Hi,

We do not currently have network connectivity to an in house smtp relay server.    Do I need to use an IIS Server for this or how can I do this to the safest relay server without using an in - house mail server for the short term:

http://www.howtogeek.com/120011/stupid-geek-tricks-how-to-send-email-from-the-command-line-in-windows-without-extra-software/

SMTP using .net w/o mail server

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.

Exchange

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.