3
In civicrm.settings.php there's some settings to log it all to a file. See https://docs.civicrm.org/dev/en/latest/tools/debugging/#changing-file-based-settings
define('CIVICRM_MAIL_LOG', '/file/path');
define('CIVICRM_MAIL_LOG_AND_SEND', 1);
2
If it's your current MTA, Postfix has an option to BCC all emails to an address: always_bcc
https://stackoverflow.com/questions/1491552/i-would-like-to-add-a-bcc-to-all-mails-going-out-from-my-postfix#1491586
http://www.postfix.org/ADDRESS_REWRITING_README.html
More complex solutions can be implemented.
1
I often use 3rd party mailing services (namely mailgun, mandrill but have used others too). You can pay these services a lot to keep all your mail for a while, but the sheer amount of it will always be an issue if you're looking to capture every single mail that goes out.
I have implemented an exim4 configuration that keeps a copy in a local Maildir at ...
1
From an admin (non-sysadmin) perspective, the extension invoicehelper has options to automatically cc/bcc specific emails, notably for offline membership/contribution emails.
It does not handle the simple "Send Email" form, however. And one thing I get asked often, is that when viewing emails sent (activities), it should display who was CC'ed/BCC'ed. For ...
1
Another option you may want to consider is installing CiviProxy. You set it up somewhere on the public Internet (I imagine a free hosting account would suffice), whitelist its IP in your firewall, and it has a very limited ability to talk to CiviCRM. But the CiviProxy extension will rewrite your URL tracking to go to the proxy - and the proxy knows how to ...
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