Pegasus Mail & Mercury

Greenman: I've checked the information as you suggested. The postmaster account is a username: admin without a domainname.co.uk The local domains are included in the list: apsarchaeology; apsarchaeology.co.uk; lincsheritage; lincsheriatge.org and there are no filters setup which forward mail from the admin ...

Greenman: With regards to the send message feature, I have tried what you suggested but the core module displays an error: postmaster@apsarchaeology.co.u - Notification discarded - potential loop.   Hmm.  Insidious!  Just double check these: * Postmaster (core module) is a username (no domain) that is valid here * Local ...

Greylisting won't help you because the spammers can just dump their mail onto your backup MX which will then happily relay it on to you from both a trusted and persistent (genuine) mailer and address.   It's unlikely that a UK ISP would neglect to provide an outgoing smarthost (SMTP/submission) server.  But yes, MercuryE is the module ...