On 2020-10-01 15:18, Ranjan Maitra wrote: > Thanks, very much. So when I hit "Send" on sylpheed, it goes on a tailspin, > and says: Connecting to SMTP server: localhost > > Looking at the /var/log/maillog as you suggested, I get: > > Oct 1 14:08:00 localhost postfix/smtpd[4142479]: fatal: in parameter > smtpd_relay_restrictions or smtpd_recipient_restrictions, specify at least > one working instance of: reject_unauth_destination, defer_unauth_destination, > reject, defer, defer_if_permit or check_relay_domains
That is your problem. You haven’t told Postfix what restrictions it should impose on mail relaying, so it exits to avoid becoming an open relay. Demi
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