How to Get Outlook to Send Mail Via SMTP if You Get Error 530

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Your Outlook settings work fine at home, sending/receiving mail. You're on the road now, and you can no longer send, but only receive mails. You're getting an Error 530 or Outlook error 0x800CCC78.
The problem is the on-the-road ISP may be blocking port 25, and/or your ISP might not accept mail being relayed from other network domains. SBC Yahoo allows you to change your SMTP port from 25 to 587. Most ISPs let port 587 flow through. Internet access works, receiving email works, you just can no longer send. What the heck?!

• Steps

1. Go to Outlook, Tools, Accounts, Server, Advanced, and change the SMTP port from 25 to 587. Hit Apply, OK, then exit/restart Outlook.
2. Start Outlook, create a test email and send it. Should work fine.
3. The solution might vary with other ISPs. Your home ISP must support an alternate port for SMTP TCP traffic, and the current ISP providing you access must not block that alternative port.
4. Recognize this is all the fault of spammers and the ISPs trying to slow them down. This is why they block port 25 for non-customers.

• Tips

1. If this doesn't work, just change the port back to port 25 and wait until you get home to catch up on email.
2. Alternatively, as with SBC Yahoo mail, you can always use the Webmail interface. This, like all other web pages, uses port 80, which ISPs do not block.
3. Remember to change the port back once you're back at home!

Source: www.wikihow.com