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SMTP Not Working

B

BDawg

Lifer
When I left for vacation on Friday, everything worked beautifully.

When I came back on Monday, nobody at my house was able to send e-mail through our telnap hosted domain.

When I try to send an e-mail, I get an error 0x800CCC65 with the text,

The Server Responded:
503 valid RCPT command must precede DATA
or
503 recipients not vaild (but they are)

I figured it must be something with Telnap, but when I went to work today, I was able to send fine through that network.

The oddest thing is that when I sent a test message through the account settings it worked fine.

Currently, antivirus is turned off. That didn't change anything.

Any ideas?
 
On a hunch, and since the test e-mail worked, I tried to send an e-mail manually to another account in my domain (i.e. my wife's).

This one went through fine (you can see in the headers where it hit telnap and everything).

Still, when I send to an outside address, I get errors.
 
"503 valid RCPT command must precede DATA" means that your SMTP client is not authenticating before it tries to send mail. You either need to set it up so that it logs into pop or imap immediately prior to sending the mail, or you need to activate SMTP authentication (using the same username and password that you use to check your email.)
 
How in the world would something have changed since I left on Friday when things were working perfectly on both the machines here?

Where do you change the authentication so it sends immedately prior to sending? Authentication has been set up and working up until this weekend.

Can I assume that I don't have to authenticate to send e-mail to other accounts in my domain?
 
I tried to use the automatic configurations through cPanel for Outlook Express, but it doesn't work there either. 🙁
 
Originally posted by: BDawg
I switched outgoing server port to 26. Does this mean that my ISP started blocking 25?
Click to expand...

Unlikely, but it is a possibility. I'll ask my admins what server upgrades were performed over this weekend and get back to you regarding that.
 
If you want to know if your ISP is suddenly blocking outgoing TCP Port 25, try telnetting to one of AOL's mailservers:

At the DOS prompt:
"Telnet mailin-01.mx.aol.com 25"

If the response times out, your outgoing port 25 is being blocked.
If you get any kind of response from AOL, then your problem lays elsewhere.
 
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