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Hi, my development site is running on IIS with SMTP server. Mail is working fine when creating new users or getting a password reset. I have built a webform and upon submitting I'll get this error:
* warning: mail() [function.mail]: SMTP server response: 501 5.5.4 Invalid Address in C:\Inetpub\wwwroot\BHI_dev\includes\mail.inc on line 193. * Unable to send e-mail. Please contact the site admin, if the problem persists.
The address I use in my testing are in fact completely valid. Seems like webform is not playing nice with the core somehow. Further ideas?
Using Drupal 6.2.