Code:
Nov 19 15:13:55 ns5 postfix/smtpd[14871]: 30FF84D0E62: client=mail-wy0-f182.google.com[74.125.82.182]
Nov 19 15:13:55 ns5 postfix/cleanup[20754]: 30FF84D0E62: message-id=<E5996FE4-6B74-43F1-864A-D1C98396DE83@gmail.com>
Nov 19 15:13:55 ns5 postfix/qmgr[11706]: 30FF84D0E62: from=<alfxxx@gmail.com>, size=9169, nrcpt=1 (queue active)
Nov 19 15:13:55 ns5 postfix/virtual[20755]: 30FF84D0E62: to=<xxxx@xxxx.es>, relay=virtual, delay=16, delays=16/0/0/0, dsn=2.0.0, status=sent (delivered to maildir)
Nov 19 15:13:55 ns5 postfix/qmgr[11706]: 30FF84D0E62: removed
Nov 19 15:13:58 ns5 postfix/smtpd[14433]: connect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:13:58 ns5 postfix/smtpd[18309]: connect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:13:58 ns5 postfix/smtpd[14433]: NOQUEUE: reject: RCPT from mail.xxx.com[80.169.xxx.xxx]: 450 4.7.1 <EXCHANGE.xxx.COM>: Helo command rejected: Host not found; from=<xxxo@GRUPOxxx.COM> to=<xxx@xxx.es> proto=ESMTP helo=<EXCHANGE.xxx.COM>
Nov 19 15:13:58 ns5 postfix/smtpd[18309]: NOQUEUE: reject: RCPT from mail.xxx.com[80.169.xxx.xxx]: 450 4.7.1 <EXCHANGE.xxx.COM>: Helo command rejected: Host not found; from=<xxxx@GRUPOxxx.COM> to=<xxx@xxx.com> proto=ESMTP helo=<EXCHANGE.xxx.COM>
Nov 19 15:13:58 ns5 postfix/smtpd[14433]: disconnect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:13:58 ns5 postfix/smtpd[18309]: disconnect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:13:58 ns5 imapd: LOGOUT, user=xxx@xxx.es, ip=[::ffff:178.239.xx.xxx], headers=0, body=193192, rcvd=153, sent=196483, time=15
Nov 19 15:14:06 ns5 postfix/policyd-weight[20341]: decided action=PREPEND X-policyd-weight: using cached result; rate: -5.5
Nov 19 15:14:06 ns5 postgrey[3168]: delayed 310 seconds: client=n1s.uss.es, from=isabel.sanz@xxx.es, to=xxx@xxx.es
Nov 19 15:14:06 ns5 postfix/smtpd[14486]: 2F4734D0E62: client=n1s.uss.es[62.82.143.10]
Nov 19 15:14:06 ns5 postfix/cleanup[20754]: 2F4734D0E62: message-id=<8CD607C4CE949D47866C25734DD869C80C12F5D16C@walle.sion.es>
Nov 19 15:14:06 ns5 postfix/qmgr[11706]: 2F4734D0E62: from=<isabel.sanz@unique.es>, size=12241, nrcpt=1 (queue active)
Nov 19 15:14:06 ns5 postfix/virtual[20755]: 2F4734D0E62: to=<xxx@xxx.es>, relay=virtual, delay=13, delays=13/0/0/0, dsn=2.0.0, status=sent (delivered to maildir)
Nov 19 15:14:06 ns5 postfix/qmgr[11706]: 2F4734D0E62: removed
Nov 19 15:14:06 ns5 postfix/smtpd[14486]: disconnect from n1s.uss.es[62.82.143.10]
Nov 19 15:14:08 ns5 postfix/smtpd[15338]: connect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:14:08 ns5 postfix/smtpd[15338]: NOQUEUE: reject: RCPT from mail.xxx.com[80.169.xxx.xxx]: 450 4.7.1 <EXCHANGE.xxx.COM>: Helo command rejected: Host not found; from=<xxx@xxx.COM> to=<xxx@xxx.com> proto=ESMTP helo=<EXCHANGE.xxx.COM>
Nov 19 15:14:08 ns5 postfix/smtpd[15338]: NOQUEUE: reject: RCPT from mail.xxx.com[80.169.xxx.xxx]: 450 4.7.1 <EXCHANGE.xxx.COM>: Helo command rejected: Host not found; from=<xxx@xxx.COM> to=<xxx@xxx.com> proto=ESMTP helo=<EXCHANGE.xxx.COM>
Nov 19 15:14:08 ns5 postfix/smtpd[15338]: disconnect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:14:11 ns5 courierpop3login: TIMEOUT, user=xxx@xxx.com, ip=[::ffff:212.xx.xxx.56], top=0, retr=0, rcvd=6, sent=25, time=300
Nov 19 15:14:14 ns5 courierpop3login: LOGOUT, user=xxx@xxx.com, ip=[::ffff:80.xxx.xxx.33], top=0, retr=0, rcvd=12, sent=39, time=79
Nov 19 15:14:16 ns5 postfix/smtpd[15390]: connect from host86-157-127-138.range86-157.btcentralplus.com[86.157.127.138]
Nov 19 15:14:16 ns5 postfix/smtpd[15390]: lost connection after CONNECT from host86-157-127-138.range86-157.btcentralplus.com[86.157.127.138]
Nov 19 15:14:16 ns5 postfix/smtpd[15390]: disconnect from host86-157-127-138.range86-157.btcentralplus.com[86.157.127.138]
Nov 19 15:14:18 ns5 postfix/smtpd[15339]: connect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:14:18 ns5 postfix/smtpd[15391]: connect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:14:18 ns5 postfix/smtpd[15339]: NOQUEUE: reject: RCPT from mail.xxx.com[80.169.xxx.xxx]: 450 4.7.1 <EXCHANGE.xxx.COM>: Helo command rejected: Host not found; from=<xxx@xxx.COM> to=<xxx@xxx.es> proto=ESMTP helo=<EXCHANGE.xx.COM>
Nov 19 15:14:18 ns5 postfix/smtpd[15391]: NOQUEUE: reject: RCPT from mail.xxx.com[80.169.xxx.xxx]: 450 4.7.1 <EXCHANGE.xxx.COM>: Helo command rejected: Host not found; from=<xxx@xxx.COM> to=<xxx@xxx.com> proto=ESMTP helo=<EXCHANGE.xx.COM>
Nov 19 15:14:18 ns5 postfix/smtpd[15339]: disconnect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:14:18 ns5 postfix/smtpd[15391]: disconnect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:14:25 ns5 postfix/smtpd[14871]: disconnect from mail-wy0-f182.google.com[74.125.82.182]
Nov 19 15:14:29 ns5 imapd: LOGIN, user=xxx@axxx.es, ip=[::ffff:178.xxx.xx.225], protocol=IMAP
Nov 19 15:14:30 ns5 postfix/smtpd[20806]: fatal: No server certs available. TLS can't be enabled
Nov 19 15:14:31 ns5 postfix/master[11695]: warning: process /usr/lib/postfix/smtpd pid 20806 exit status 1
Nov 19 15:14:31 ns5 postfix/master[11695]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling
Nov 19 15:14:34 ns5 imapd: LOGOUT, user=xxx@xxx.es, ip=[::ffff:178.xx.xx.225], headers=0, body=12080, rcvd=152, sent=12980, time=5
Nov 19 15:14:38 ns5 postfix/smtpd[14487]: connect from mail.xxx.com[80.169.xxx.xxx]
Nov 19 15:14:38 ns5 postfix/smtpd[14487]: NOQUEUE: reject: RCPT from mail.xxx.com[80.169.xxx.xxx]: 450 4.7.1 <EXCHANGE.xxx.COM>: Helo command rejected: Host not found; from=<xxx@xxx.COM> to=<xxx@xxx.com> proto=ESMTP helo=<EXCHANGE.xxx.COM>
Nov 19 15:14:38 ns5 postfix/smtpd[14487]: disconnect from mail.xxx.com[80.169.xxx.xxx]