Over the past 20 years, I've setup a lot of mail servers at work. These are mostly based on Postfix / Spamassassin / Dovecot, using IMAP for the clients. Recently, I started using Roundcube for webmail. Postfix, uses several blacklists to block spam at the MTA level, these come pre-configured with the control panel, which blocks 99% of spam, and...
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