Error 301: ?

[vtjballeng]

I shipped a package and before I get the tracking information and a price from the software popup, an error message pops up that says "Error 301:" , when I clicked on the more info/troubleshooting button I was taken here: http://www.zfirm.com/knowledge_bases/shiprush/sr4-009.txt. Everything appears to be valid with this shipment though I don't know that the shipping email was properly sent, this appeared to happen just after sending emails was completed. Any ideas as to what this is? I did have $$ deducted from my endicia account and a label did print.

[vtjballeng]

Screehshot attached.

[SYSOPS]

Email function with the Postal portion of our software may not be functioning correctly right now. Please turn that option off.

As noted in the announcements section for USPS and Endicia:

Notes:
The email notification area is getting reworked. If you experience errors in this area, either turn off email notifications or adjust settings.

Thank you,
SYSOPS