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    <p>1) I'd be surprised if you found a public SMTP server to do this as it would just be used heavily as a spam relay.</p> <p>2) A lot of residential ISPs do block SMTP traffic from leaving their network. However, they are doing this by blocking port 25 so if you host your own SMTP server on an alternate port it won't get blocked except in the most extreme cases.</p> <p>3) see below</p> <p>I see two items you have to address:</p> <p><strong>Getting the message from the sender to you</strong><br> Conrad's suggestion of using a web service is a good one as it gives you more control over the transport of the message to you. You can implement whatever authentication you deem necessary to make sure the person sending the message is legit. You could use SMTP to send the messages through a mail server hosted by you, but would need to focus on knowing who to safely allow to send and who not to so you don't end up as a spam relay.</p> <p><strong>Sending the message from you to the recipient</strong><br> You can still send the message to the final recipient via SMTP to their mail host. I would suggest sending the email with the from as your application (ex: mailagent@myapplication.com) and define the reply-to address for your original sender. If you try using their address in the from, you will get more spam rejections.</p> <p>If I understood your description, the messages will only be being sent to other users of the application?<br> If so, you could take the web service route on both parts of the communication. Sender delivers the message to your centralized server over a web service call, when the recipient user opens the software, it checks with your server to see if there are any messages waiting for them.</p> <p><strong>EDIT:</strong><br> Yes, the part on the destination emails, I could read it both ways, guess I leaned toward the wrong one. </p> <p>You will have to deliver the messages in the end via smtp, I still suggest using your own from and put the sender in the reply-to unless these are corporate customers that you can get to add your smtp server to their SPF records.</p> <p>Also, investigate specific major mail targets like Yahoo! and GMail for how to interact with them such as: <a href="http://mail.google.com/support/bin/answer.py?hl=en&amp;answer=81126" rel="nofollow noreferrer">http://mail.google.com/support/bin/answer.py?hl=en&amp;answer=81126</a><br> <a href="http://help.yahoo.com/l/us/yahoo/mail/postmaster/postmaster-15.html" rel="nofollow noreferrer">http://help.yahoo.com/l/us/yahoo/mail/postmaster/postmaster-15.html</a><br> <a href="http://help.yahoo.com/l/us/yahoo/mail/postmaster/bulkv2.html" rel="nofollow noreferrer">http://help.yahoo.com/l/us/yahoo/mail/postmaster/bulkv2.html</a> </p>
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    1. COHi ManiacZX Thanks for your reply. Just a few comments 1) I implemented Hotmail's SMTP in our code, and initial tests seems like it works ok. However, i assume it may get blocked for various reasons if it is run from other networks by the end-user of our software. 2) Hotmail SMTP uses port 25, but also port 587 with TLS or SSL Encryption if 25 is blocked.
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    2. CO3) You may have misunderstood my original description. Our windows application is a financial software tool. Just like many other software tools, it creates a data file (just like xls for Excel and doc for Word). I want to add a function in our software to allow the user to send the file to any email recipient. This is similar to the "File > Send To > Mail Recipient (as Attachment)" option in Microsoft Office, however, instead of launching their default mail client in Windows, and sending it through that, i want to ask the user for an email address and then we send the file programmaticly.
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    3. COIf hotmail is letting you set the from to whomever you want, I'd be cautious in using that in a released application as I doubt it is an intended feature and so could change at any time.
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