This short article addresses a specific error that occurs when an internet service provider restricts a user's ability to send email through non-local Email Servers.  I threw this together quickly, so I hope the content is helpful and mollifies the typos.

The Error Message
 

The Cause

The most common cause of this error is a restrictive (ISP) internet service provider. The ISP you're using won't allow you to use the Outgoing Mail Server (SMTP) that your email software designates.  They do this to reduce or prevent abuse; they don't want junk mailers going through their network with masses of junk email.

Review:  How Sending Email Works
( a quick explanation to aid your understanding of the solution presented later)

When you send an email, it must first travel to an Outgoing SMTP Mail Server  that will direct your message to the Incoming Email Server of the person you ultimately want the message to be delivered to. Normally, you can't send an email (from your computer) directly to the Incoming Mail Server of the recipient. Again, it must first be sent to the Outgoing SMTP Mail Server designated in the email software you use.  Internet service providers have the ability to restrict their users from sending email to unapproved outgoing SMTP mail servers.  If the SMTP mail server designated in your email software is blocked, you will not be able send outgoing email.  This designation is a setting in your email software that can be changed (see Solution 1 below).

Solution

1.  Change the settings in your email software so that the email account you're using designates an Outgoing Email Service that your internet service provider won't block.  Your internet service provider should provide you with the address of an acceptable Outgoing SMTP Mail Server. This information is often listed on their website; if it isn't, call their technical support and ask them the address of their Outgoing Email Server.  Then go into your email software and change your current Outgoing SMTP Address to the one your ISP requires.

2. After you designate a SMTP address not restricted by your ISP, you may still receive the following error:

Port: 25, Secure(SSL): No, Server Error: 530, Error Number: 0x800CCC78

Now you are reaching the Outgoing SMTP Mail Server, but it won't process your request without further authorization.  You will need to go into your Email Software and find the setting that indicates that your Outgoing SMTP requires further authorization.  Select this setting and enter the username and password required by your ISP (or reqired by who ever is the administrator of the Outgoing SMTP Mail Server that's not blocked by your ISP).  For example, at the time this article was written MSN Internet Service's SMTP Address was:  (secure.smtp.email.msn.com).  However, this email server won't allow you to use it unless you send your MSN username and password along with your request to send email.

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