I have had a perfect Debian Nginx server up for a few months. Reciently I stopped receiving emails but can still send to a gmail account. When I looked at /var/log/mail.err .info or .log they were huge, take a long time to cat, are loaded with tons of unknown email addresses and are being rejected by other servers. mail.log HTML: Nov 23 23:07:02 server1 postfix/smtp: 8E6EAE81C89: to=<[email protected]>, relay=mta7.am0.yahoodns.net[22.214.171.124]:25, delay=0.97, delays=0.11/0.01/0.79/0.07, dsn=4.7.0, status=deferred (host mta7.am0.yahoodns.net[126.96.36.199] said: 421 4.7.0 [TS01] Messages from (MY IP) temporarily deferred due to user complaints - 188.8.131.52; see http://postmaster.yahoo.com/421-ts01.html (in reply to MAIL FROM command)) mail.info HTML: Nov 23 21:32:04 server1 postfix/smtp: 6D293E80F9B: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, conn_use=2, delay=12, delays=2.6/0/0/9.3, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 031F5E81A22) mail.err HTML: Nov 24 06:32:06 mr1 amavis: (25978-01) (!!)TROUBLE in process_request: connect_to_sql: unable to connect to any dataset at (eval 111) line 247. Nov 24 06:42:24 mr1 dovecot: auth-worker(27303): Error: mysql(localhost): Connect failed to database (dbispconfig): Too many connections - waiting for 1 seconds before retry deleted this mailbox for troubleshooting HTML: Nov 24 07:22:57 mr1 dovecot: auth-worker(32186): Error: sql([email protected],184.108.40.206): Password query failed: Not connected to database How do I fix and prevent this problem? thanks.