Due to the nature of the company I work for, we need to keep a history of all communication with our customers, including sent emails, and can't really rely on staff to back-up email with any regularity.

We are currently paying for managed mail hosting, and their archiving options are rather limited: they'll forward a copy of all incoming/outgoing emails to a specified mailbox.

Can anyone suggest other solutions to backing-up emails? We're happy to switch our managed email hosting to an internal server if this can provide us with more options, but as I'm not an expert on MTA software I'm not sure where to go from here.

All suggestions welcome. Thanks.

Postfix has a few more bcc options. See here.

Thanks, but I don't think that'll do it. What we don't want is one inbox that gets inundated by hundreds of emails daily which we'll have to search through to find a particular email for a known user. We'd prefer that their account on the server aggregates the data marking email as "ready to archive" (or some-such) when they retrieve the email, but that it stays on the server and isn't deleted. We also need to capture all sent emails and keep those in a sent folder.

Please let me know if you would like to discuss our option offline