tail -f /var/log/mail.log | grep -i smtp Jan 29 15:28:41 srvcepsar01 postfix/smtpd[34753]: disconnect from unknown[192.168.2.9] ehlo=2 starttls=1 auth=1 mail=1 rcpt=3 data=1 quit=1 commands=10 Jan 29 15:29:02 srvcepsar01 postfix/anvil[25970]: statistics: max connection rate 1/60s for (smtp:62.60.130.246) at Jan 29 15:19:02 Jan 29 15:29:02 srvcepsar01 postfix/anvil[25970]: statistics: max connection count 1 for (smtp:62.60.130.246) at Jan 29 15:19:02 Jan 29 15:29:24 srvcepsar01 postfix/smtp[35763]: B57E6704EA4: host gmail-smtp-in.l.google.com[142.250.114.27] said: 452-4.2.2 The recipient's inbox is out of storage space. Please direct the 452-4.2.2 recipient to 452 4.2.2 https://support.google.com/mail/?p=OverQuotaTemp 46e09a7af769-7d18c68b89esi3478214a34.66 - gsmtp (in reply to RCPT TO command) Jan 29 15:29:25 srvcepsar01 postfix/smtp[35769]: 6DC27706E26: host mx00.mail.com[74.208.5.20] refused to talk to me: 421-mail.com (mxgmxus002) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.mail.com/en/case?c=r0604&i=ip&v=45.164.238.33&r=1MkZCy-1wAEXt33BG-00ZE0y Jan 29 15:29:26 srvcepsar01 postfix/smtp[35763]: B57E6704EA4: to=, relay=alt1.gmail-smtp-in.l.google.com[74.125.27.27]:25, delay=92853, delays=92851/0.05/2.5/0.18, dsn=4.2.2, status=deferred (host alt1.gmail-smtp-in.l.google.com[74.125.27.27] said: 452-4.2.2 The recipient's inbox is out of storage space. Please direct the 452-4.2.2 recipient to 452 4.2.2 https://support.google.com/mail/?p=OverQuotaTemp 586e51a60fabf-409575dc8e0si4610472fac.237 - gsmtp (in reply to RCPT TO command)) Jan 29 15:29:26 srvcepsar01 postfix/smtp[35766]: 3F82A706D92: host mx01.ionos.com[74.208.5.21] refused to talk to me: 421-perfora.net (mxeueus012) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.1und1.de/en/case?c=r0604&i=ip&v=45.164.238.33&r=1MSZ5Z-1vIfms2sJ7-00V1Be Jan 29 15:29:26 srvcepsar01 postfix/smtp[35764]: 92A13706E4D: host mx00.mail.com[74.208.5.20] refused to talk to me: 421-mail.com (mxgmxus012) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.mail.com/en/case?c=r0604&i=ip&v=45.164.238.33&r=1MPs4r-1vOfGi30Yl-00KI0B Jan 29 15:29:27 srvcepsar01 postfix/smtp[35769]: 6DC27706E26: to=, relay=mx01.mail.com[74.208.5.22]:25, delay=92838, delays=92834/0.08/4.1/0, dsn=4.0.0, status=deferred (host mx01.mail.com[74.208.5.22] refused to talk to me: 421-mail.com (mxgmxus003) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.mail.com/en/case?c=r0604&i=ip&v=45.164.238.33&r=1N4eKX-1vuTuU3E7L-016JEL) Jan 29 15:29:27 srvcepsar01 postfix/smtp[35764]: 92A13706E4D: to=, relay=mx01.mail.com[74.208.5.22]:25, delay=92918, delays=92914/0.05/4.2/0, dsn=4.0.0, status=deferred (host mx01.mail.com[74.208.5.22] refused to talk to me: 421-mail.com (mxgmxus003) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.mail.com/en/case?c=r0604&i=ip&v=45.164.238.33&r=1MWz0Z-1vEFw73I5J-00SIW8) Jan 29 15:29:29 srvcepsar01 postfix/smtp[35766]: 3F82A706D92: to=, relay=mx00.ionos.com[74.208.5.3]:25, delay=189393, delays=189386/0.07/6.1/0, dsn=4.0.0, status=deferred (host mx00.ionos.com[74.208.5.3] refused to talk to me: 421-perfora.net (mxeueus010) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.1und1.de/en/case?c=r0604&i=ip&v=45.164.238.33&r=1N5lf5-1vmljx39j9-00quAY) Jan 29 15:29:29 srvcepsar01 postfix/smtp[35766]: 3F82A706D92: to=, relay=mx00.ionos.com[74.208.5.3]:25, delay=189393, delays=189386/0.07/6.1/0, dsn=4.0.0, status=deferred (host mx00.ionos.com[74.208.5.3] refused to talk to me: 421-perfora.net (mxeueus010) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.1und1.de/en/case?c=r0604&i=ip&v=45.164.238.33&r=1N5lf5-1vmljx39j9-00quAY) Jan 29 15:29:32 srvcepsar01 postfix/smtp[35765]: 97492706D3F: to=, relay=baseballrolin.com[41.216.188.93]:25, delay=292362, delays=292353/0.06/7.8/0.83, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 8F17F8962E) Jan 29 15:29:53 srvcepsar01 postfix/smtp[35767]: connect to CEPSAR.COM[54.243.117.197]:25: Connection timed out Jan 29 15:30:23 srvcepsar01 postfix/smtp[35767]: connect to CEPSAR.COM[13.223.25.84]:25: Connection timed out Jan 29 15:30:23 srvcepsar01 postfix/smtp[35767]: 55C91706D5C: to=, relay=none, delay=273383, delays=273323/0.07/60/0, dsn=4.4.1, status=deferred (connect to CEPSAR.COM[13.223.25.84]:25: Connection timed out) Jan 29 15:30:51 srvcepsar01 postfix/smtpd[37366]: connect from unknown[14.99.61.248] Jan 29 15:30:57 srvcepsar01 postfix/smtpd[37366]: warning: unknown[14.99.61.248]: SASL PLAIN authentication failed: Jan 29 15:30:59 srvcepsar01 postfix/smtpd[37366]: lost connection after AUTH from unknown[14.99.61.248] Jan 29 15:30:59 srvcepsar01 postfix/smtpd[37366]: disconnect from unknown[14.99.61.248] ehlo=1 auth=0/1 commands=1/2 Jan 29 15:31:07 srvcepsar01 postfix/smtpd[37366]: warning: hostname cm-84.211.55.124.get.no does not resolve to address 84.211.55.124: Name or service not known Jan 29 15:31:07 srvcepsar01 postfix/smtpd[37366]: connect from unknown[84.211.55.124] Jan 29 15:31:11 srvcepsar01 postfix/smtpd[37892]: warning: hostname nsg-corporate-58.202.186.122.airtel.in does not resolve to address 122.186.202.58: Name or service not known Jan 29 15:31:11 srvcepsar01 postfix/smtpd[37892]: connect from unknown[122.186.202.58] Jan 29 15:31:12 srvcepsar01 postfix/smtpd[37366]: lost connection after CONNECT from unknown[84.211.55.124] Jan 29 15:31:12 srvcepsar01 postfix/smtpd[37366]: disconnect from unknown[84.211.55.124] commands=0/0 Jan 29 15:31:21 srvcepsar01 postfix/smtpd[37892]: warning: unknown[122.186.202.58]: SASL PLAIN authentication failed: Jan 29 15:31:23 srvcepsar01 postfix/smtpd[37892]: lost connection after AUTH from unknown[122.186.202.58] Jan 29 15:31:23 srvcepsar01 postfix/smtpd[37892]: disconnect from unknown[122.186.202.58] ehlo=1 auth=0/1 commands=1/2 Jan 29 15:32:01 srvcepsar01 postfix/smtpd[38974]: connect from unknown[92.118.39.210] Jan 29 15:32:04 srvcepsar01 postfix/smtpd[38974]: warning: unknown[92.118.39.210]: SASL PLAIN authentication failed: Jan 29 15:32:04 srvcepsar01 postfix/smtpd[38974]: disconnect from unknown[92.118.39.210] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:32:08 srvcepsar01 postfix/smtpd[39065]: connect from unknown[92.118.39.203] Jan 29 15:32:11 srvcepsar01 postfix/smtpd[39065]: warning: unknown[92.118.39.203]: SASL PLAIN authentication failed: Jan 29 15:32:11 srvcepsar01 postfix/smtpd[39065]: disconnect from unknown[92.118.39.203] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:32:24 srvcepsar01 postfix/smtpd[38974]: connect from unknown[92.118.39.214] Jan 29 15:32:27 srvcepsar01 postfix/smtpd[38974]: warning: unknown[92.118.39.214]: SASL PLAIN authentication failed: Jan 29 15:32:27 srvcepsar01 postfix/smtpd[38974]: disconnect from unknown[92.118.39.214] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:32:48 srvcepsar01 postfix/smtpd[39065]: connect from unknown[92.118.39.205] Jan 29 15:32:51 srvcepsar01 postfix/smtpd[39065]: warning: unknown[92.118.39.205]: SASL PLAIN authentication failed: Jan 29 15:32:51 srvcepsar01 postfix/smtpd[39065]: disconnect from unknown[92.118.39.205] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:33:00 srvcepsar01 postfix/smtpd[37892]: connect from unknown[192.168.1.228] Jan 29 15:33:01 srvcepsar01 postfix/smtpd[37892]: 6B6D4706BC8: client=unknown[192.168.1.228], sasl_method=PLAIN, sasl_username=irene.zuniga@cepsar.mx Jan 29 15:33:01 srvcepsar01 amavis[50593]: (50593-03) ESMTP :10024 /var/lib/amavis/amavis-20260129T145137-50593-KiI2xQXJ: -> SIZE=75396 Received: from smtp.cepsar.mx ([127.0.0.1]) by localhost (srvcepsar01.cepsar.lan [127.0.0.1]) (amavisd-new, port 10024) with ESMTP for ; Thu, 29 Jan 2026 15:33:01 -0600 (CST) Jan 29 15:33:02 srvcepsar01 postfix/smtpd[40597]: connect from localhost.localdomain[127.0.0.1] Jan 29 15:33:02 srvcepsar01 postfix/smtpd[40597]: 5BB6C706BD7: client=localhost.localdomain[127.0.0.1] Jan 29 15:33:02 srvcepsar01 postfix/smtpd[40597]: disconnect from localhost.localdomain[127.0.0.1] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5 Jan 29 15:33:02 srvcepsar01 amavis[50593]: (50593-03) t5YjF3kk6IQD FWD from -> , BODY=7BIT 250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 5BB6C706BD7 Jan 29 15:33:02 srvcepsar01 postfix/smtp[40583]: 6B6D4706BC8: to=, relay=127.0.0.1[127.0.0.1]:10024, delay=1.3, delays=0.76/0.02/0/0.55, 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 5BB6C706BD7) Jan 29 15:33:04 srvcepsar01 postfix/smtpd[37892]: disconnect from unknown[192.168.1.228] ehlo=2 starttls=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=8 Jan 29 15:33:15 srvcepsar01 postfix/smtpd[38974]: connect from unknown[62.60.130.246] Jan 29 15:33:16 srvcepsar01 postfix/smtpd[38974]: warning: unknown[62.60.130.246]: SASL LOGIN authentication failed: Invalid authentication mechanism Jan 29 15:33:16 srvcepsar01 postfix/smtpd[38974]: disconnect from unknown[62.60.130.246] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:33:21 srvcepsar01 postfix/smtpd[38974]: connect from unknown[91.92.240.37] Jan 29 15:33:22 srvcepsar01 postfix/smtpd[38974]: warning: unknown[91.92.240.37]: SASL LOGIN authentication failed: Invalid authentication mechanism Jan 29 15:33:22 srvcepsar01 postfix/smtpd[38974]: disconnect from unknown[91.92.240.37] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:33:31 srvcepsar01 postfix/smtpd[39065]: connect from unknown[92.118.39.204] Jan 29 15:33:33 srvcepsar01 postfix/smtpd[39065]: warning: unknown[92.118.39.204]: SASL PLAIN authentication failed: Jan 29 15:33:33 srvcepsar01 postfix/smtpd[39065]: disconnect from unknown[92.118.39.204] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:33:45 srvcepsar01 postfix/smtpd[38974]: connect from unknown[92.118.39.202] Jan 29 15:33:48 srvcepsar01 postfix/smtpd[38974]: warning: unknown[92.118.39.202]: SASL PLAIN authentication failed: Jan 29 15:33:48 srvcepsar01 postfix/smtpd[38974]: disconnect from unknown[92.118.39.202] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:33:59 srvcepsar01 postfix/smtpd[39065]: connect from unknown[92.118.39.228] Jan 29 15:34:02 srvcepsar01 postfix/smtpd[39065]: warning: unknown[92.118.39.228]: SASL PLAIN authentication failed: Jan 29 15:34:02 srvcepsar01 postfix/smtpd[39065]: disconnect from unknown[92.118.39.228] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:34:06 srvcepsar01 postfix/smtpd[38974]: connect from unknown[92.118.39.233] Jan 29 15:34:09 srvcepsar01 postfix/smtpd[41875]: connect from unknown[92.118.39.229] Jan 29 15:34:09 srvcepsar01 postfix/smtpd[38974]: warning: unknown[92.118.39.233]: SASL PLAIN authentication failed: Jan 29 15:34:09 srvcepsar01 postfix/smtpd[38974]: disconnect from unknown[92.118.39.233] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:34:11 srvcepsar01 postfix/smtpd[41875]: warning: unknown[92.118.39.229]: SASL PLAIN authentication failed: Jan 29 15:34:11 srvcepsar01 postfix/smtpd[41875]: disconnect from unknown[92.118.39.229] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:34:15 srvcepsar01 postfix/smtpd[39065]: connect from unknown[92.118.39.213] Jan 29 15:34:17 srvcepsar01 postfix/smtpd[39065]: warning: unknown[92.118.39.213]: SASL PLAIN authentication failed: Jan 29 15:34:17 srvcepsar01 postfix/smtpd[39065]: disconnect from unknown[92.118.39.213] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:34:20 srvcepsar01 postfix/smtpd[38974]: connect from unknown[unknown] Jan 29 15:34:20 srvcepsar01 postfix/smtpd[38974]: lost connection after CONNECT from unknown[unknown] Jan 29 15:34:20 srvcepsar01 postfix/smtpd[38974]: disconnect from unknown[unknown] commands=0/0 Jan 29 15:34:23 srvcepsar01 postfix/smtp[42482]: CAA14706E6E: host mx01.ionos.mx[74.208.5.21] refused to talk to me: 421-perfora.net (mxeueus012) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.1und1.de/en/case?c=r0604&i=ip&v=45.164.238.33&r=1M9qxd-1vhzHW3nxV-003UNH Jan 29 15:34:26 srvcepsar01 postfix/smtp[42482]: CAA14706E6E: to=, relay=mx00.ionos.mx[74.208.5.3]:25, delay=80310, delays=80308/0.05/2.2/0, dsn=4.0.0, status=deferred (host mx00.ionos.mx[74.208.5.3] refused to talk to me: 421-perfora.net (mxeueus011) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.1und1.de/en/case?c=r0604&i=ip&v=45.164.238.33&r=1MP2GG-1vOOzj44pI-00SYWf) Jan 29 15:34:26 srvcepsar01 postfix/smtp[42482]: CAA14706E6E: to=, relay=mx00.ionos.mx[74.208.5.3]:25, delay=80310, delays=80308/0.05/2.2/0, dsn=4.0.0, status=deferred (host mx00.ionos.mx[74.208.5.3] refused to talk to me: 421-perfora.net (mxeueus011) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.1und1.de/en/case?c=r0604&i=ip&v=45.164.238.33&r=1MP2GG-1vOOzj44pI-00SYWf) Jan 29 15:34:26 srvcepsar01 postfix/smtp[42483]: 12ABD706D44: host mx01.ionos.com[74.208.5.21] refused to talk to me: 421-perfora.net (mxeueus008) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.1und1.de/en/case?c=r0604&i=ip&v=45.164.238.33&r=1Mpkg5-1w65lS3ZHh-00p35K Jan 29 15:34:26 srvcepsar01 postfix/smtp[42483]: 12ABD706D44: to=, relay=mx00.ionos.com[74.208.5.3]:25, delay=262966, delays=262963/0.04/3.1/0, dsn=4.0.0, status=deferred (host mx00.ionos.com[74.208.5.3] refused to talk to me: 421-perfora.net (mxeueus012) Nemesis ESMTP Service not available 421-Requested action aborted: local error in processing 421 For explanation visit https://postmaster.1und1.de/en/case?c=r0604&i=ip&v=45.164.238.33&r=1N3piW-1vuCZe3qD2-016XZ0) Jan 29 15:34:53 srvcepsar01 postfix/smtp[42484]: connect to hothouses.com.mx[104.21.2.198]:25: Connection timed out Jan 29 15:34:57 srvcepsar01 postfix/smtpd[41875]: connect from unknown[92.118.39.212] Jan 29 15:34:59 srvcepsar01 postfix/smtpd[41875]: warning: unknown[92.118.39.212]: SASL PLAIN authentication failed: Jan 29 15:34:59 srvcepsar01 postfix/smtpd[41875]: disconnect from unknown[92.118.39.212] ehlo=1 auth=0/1 quit=1 commands=2/3 Jan 29 15:35:11 srvcepsar01 postfix/smtpd[39065]: connect from unknown[92.118.39.211] Jan 29 15:35:13 srvcepsar01 postfix/smtpd[39065]: warning: unknown[92.118.39.211]: SASL PLAIN authentication failed: Jan 29 15:35:13 srvcepsar01 postfix/smtpd[39065]: disconnect from unknown[92.118.39.211] ehlo=1 auth=0/1 quit=1 commands=2/3