Archive for the ‘SMTP’ category

SMTP 502 Errors with “Bad Vibes” as the response text

May 1, 2007

I was trying to send mail from PHP on my local development machine and couldn’t figure out why I kept getting this response in my PHP logs:

(code: 502, response: negative vibes)

Turns out this was because I had Thunderbird open with the WebMail extension. Apparently, it creates some kind of proxy on port 25 that I was connecting to instead of the IIS SMTP service that I thought I was connecting to. I found the explanation of this problem here: