Using: Wordpress 3.3.2 with the user subscription management system s2member.
A user contacted me noting that they receive the newsletters and announcements all handled through MailChimp, but they don't receive any website system notifications via Wordpress, e.g. Lost Password notifications, etc. User checked the spam and trash folders and filters and I double-checked that the recorded e-mail address and username are correct. Everything checks out. The lost password function e-mails me at my personal gmail account in seconds. My user is at an att.net address.
I'm a bit fuzzy on the details, but I gather that Wordpress is using the innate mailer function in php and so while gmail may let it through and it shows up at "email@example.com via server.dreamhost.com" att.net blocks it entirely and prevents this user from seeing it at all.
Is this a Wordpress configuration I need to fix, or a DNS configuration mistake? Or is it possible att.net hates us? I've had no other user complaints. Not sure how to retrieve e-mail logs (if any) from Wordpress, though I think there's a plugin for that.
Any thoughts would be appreciated!