Thanks! MailChimp is an external mailer, not a plugin, so I only mentioned it to make the point that the user is receiving main identified as coming from the same address, info@… but on a different system. It connects to s2member much the same way as paypal, through an API key, etc. and the messages are generated through a MailChimp interface, not Wordpress, so the point is moot, I suppose.
In your experience, do you use any other Wordpress plugins to manage the e-mails that are sent? I know there are some that connect directly with SMTP, and perhaps that would be more stable and reliable.
I’ve added a postmaster addy and asked the user to report whether he’s received a lost password e-mail generated by the system. If it’s as simple as that, I’ll be happy Thanks!