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.
Solution:
- Go to Outlook, Tools, Accounts, Server, Advanced, and change the SMTP port from 25 to 587. Hit Apply, OK, then exit/restart Outlook.
- Start Outlook, create a test email and send it. Should work fine.
- 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.
- 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.
If this doesn't work, just change the port back to port 25.
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.
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