Drupal Auction module - Mails not send I'm using the Auction module now. The Auction works fine, but there are no emails sent to users when they place a bid. When you insert your bid 


  Unable to send e-mail. Contact the site administrator if the problem persists.


When I create an account, then i get a email with instructions. Only by the Auction module the mails will not sent. I saw one topic:

Drupal node 1945662

But there was no good answer for me. I used this module auction
Did you look at Debugging your Email on a development server? Have you looked at the Rules module and the Auction Rules to see if their firing (it sounds like they are)? Did you create hook_mail_alter() to see what email drupal thinks it's sending?

Does your "Create Account" email message fully validate as an email sent from a valid domain, etc.

It's email -- there are no easy answers :)