If this happens to you, you will find you are receiving email, but can not send email. You may get a message that your outbound mail server can not be found or does not exist. Since you are receiving email from that same mail server, you can be sure that it does exist and can be found. Since you can't SEND email out through it, your mail program is simply returning this error message to notify you that it couldn't send email using that mail server.

When you SEND email: You can only SEND email OUT through SBCGlobal mail servers. You can not SEND email OUT through any other mail servers except theirs.

When you RECEIVE email: You can continue receiving email at your domain name with your current settings. You do not need to change anything to continue receiving email at your domain name.

To SEND email, you must change your OUTBOUND SMTP mail server, under "Account Server Settings" in your mail program.

The exact setting depend on your SBCGlobal service.

• Business DSL Customers have "dedicated" IP Numbers.
• Residential DSL Customers have "dynamic" IP Numbers.

Change your OUTBOUND SMTP mail server, under "Account Server Settings" in your mail program.

1. Specify SWBell's out bound SMTP server in your outbound SMTP server Settings (smtp.SBCGlobal.net) and

2. Un-check the "my server requires authentication" check box.

3. Save, restart Outlook, click "Send and Receive" and your email should go out.

Your mail should still go out "FROM" your domain name, it just goes out through SBCGlobal mail servers instead of CommerceStreet.com's.
 

Change your OUTBOUND SMTP mail server, under "Account Server Settings" in your mail program.

1. Specify SWBell's out bound SMTP servers in your outbound SMTP server Settings (smtp.SBCGlobal.net) and

2. CHECK the "my server requires authentication" check box.

3. Select "Log on using"  and enter your SBCGlobal.net email address and the corresponding password. This is the user name and password you use to access your DSL connection.

4. Save, restart Outlook, click "Send and Receive" and your email should go out.

Your mail should still go out "FROM" your domain name, it just goes out through SBCGlobal mail servers instead of CommerceStreet.com's.
 

NOTE: Some Internet Access Providers DO change your FROM address. This is typically limited to the "Free" or "Advertising Supported" ISP's such as NetZero and Juno. They may change your FROM and REPLY TO addresses to your email address with them to direct all return email through your email account with their server since they earn advertising revenue that way to. Commercial ISP's do not normally do this, and SWBGlobal does not.
 

SBCGlobal has begun to "Block Port 25". As a result, you can only connect to SBCGlobal mail servers to SEND email out. In other words, you can only send email out through their mail servers. You can continue to receive email from your own mail server, but you can't send email out through your own mail server.

SBCGlobal did not inform their customers of this change. Their technical support personnel have not been notified either.
 

SBCGlobal and other Internet Service Providers are blocking Port 25 to reduce spam and viruses.

1. Spammers sign up for high speed Internet access accounts (such as DSL and Cable) and run their own mail server (smtp engine) to deliver their spam messages. This smtp engine connects to each spam recipient's mail server and delivers the spam directly to the recipients mail server. The ISP can not see the spam messages being delivered.
   
   When the ISP blocks Port 25, these smtp engines can not connect to recipient's mail servers and can not deliver spam messages. Instead, the spammer must send mail out through the ISP email server. The ISPs run mail server monitors to detect spammers so they turn them off quickly. This can reduce the flow of spam.
    
2. During the last year, "Commercial Viruses" have infected hundreds of thousands of computers. Commercial viruses are relatively new. They do not disrupt your computer operations or do anything "bad" to your computer. Many people do not even know their computers are infected with these viruses.
    
   Commercial Viruses let spammers connect up to the infected computer and send spam messages out using the infected computer. These infected computers are referred to as "Zombies" in the industry. Zombies have an "smtp engine" like the spammer programs and send out spam the same way, by connecting directly to the recipient's mail server.
    
   The current Zombie programs can not send out spam if Port 25 is blocked. If Zombie operators update their programming to use the ISP's outbound mail server, then operating the Zombies will be more difficult and the Zombie machines will be easier to identify and block.

Probably not. As more and more ISPs block Port 25, spammers will be pushed toward those ISPs who are not blocking Port 25. This will accelerate the move to Port 25 blocking by all ISPs.

Currently, most DSL and Cable access operators are either blocking Port 25 or are implementing Port 25 blocking. This includes Cox cable and most Bell System companies in both the United States and Canada. MSN and EarthLink also block Port 25 on dialup Internet access accounts in many areas.
 

Blocking Port 25 Traffic
'MyDoom' virus reheats the discussion
http://www.broadbandreports.com/shownews/38004

BellSouth Blocking Port 25
Not clearly informing customers
http://www.broadbandreports.com/shownews/43478

Comcast takes hard line against spam
(An article about Port 25 Blocking).
http://news.zdnet.com/2100-3513_22-5230615.html