I get thousands of emails a day to an email account and I do not know how to stop it they are of the MAILER-DAEMON type @ hostname I leave a report of the log
Mar 25 13:15:02 vps postfix/smtps/smtpd[32279]: warning: unknown[153.34.121.126]: SASL PLAIN authentication failed:
Mar 25 13:15:02 vps postfix/smtps/smtpd[8040]: warning: unknown[115.84.233.226]: SASL PLAIN authentication failed:
Mar 25 13:15:02 vps postfix/smtps/smtpd[8044]: connect from v150-95-27-59.a00e.g.bkk1.static.cnode.io[150.95.27.59]
Mar 25 13:15:02 vps postfix/smtps/smtpd[8024]: warning: hostname static.vnpt.vn does not resolve to address 14.162.144.95
Mar 25 13:15:02 vps postfix/smtps/smtpd[8024]: connect from unknown[14.162.144.95]
Mar 25 13:15:02 vps postfix/smtps/smtpd[8198]: lost connection after AUTH from unknown[169.239.121.22]
Mar 25 13:15:02 vps postfix/smtps/smtpd[8198]: disconnect from unknown[169.239.121.22] ehlo=1 auth=0/1 commands=1/2
Mar 25 13:15:02 vps postfix/smtps/smtpd[8040]: lost connection after AUTH from unknown[115.84.233.226]
Mar 25 13:15:02 vps postfix/smtps/smtpd[8040]: disconnect from unknown[115.84.233.226] ehlo=1 auth=0/1 commands=1/2
Mar 25 13:15:03 vps postfix/smtp[7372]: connect to mail.b-io.co[198.133.159.135]:25: Connection timed out
Mar 25 13:15:03 vps postfix/smtps/smtpd[32279]: lost connection after AUTH from unknown[153.34.121.126]
Mar 25 13:15:03 vps postfix/smtps/smtpd[32279]: disconnect from unknown[153.34.121.126] ehlo=1 auth=0/1 commands=1/2
Mar 25 13:15:03 vps postfix/smtp[4750]: connect to mailgw01.aare-rz.ch[194.165.44.77]:25: Connection timed out
Mar 25 13:15:03 vps postfix/smtps/smtpd[8049]: connect from static-207-222-44-101.earthlinkbusiness.net[207.222.44.101]
Mar 25 13:15:03 vps postfix/smtps/smtpd[8023]: warning: unknown[109.120.250.112]: SASL PLAIN authentication failed:
Mar 25 13:15:03 vps postfix/smtps/smtpd[8408]: warning: unknown[188.235.9.146]: SASL PLAIN authentication failed:
Mar 25 13:15:03 vps postfix/smtps/smtpd[8050]: warning: unknown[103.226.142.178]: SASL PLAIN authentication failed:
Mar 25 13:15:03 vps postfix/smtps/smtpd[8191]: connect from unknown[210.56.56.213]
Mar 25 13:15:03 vps postfix/smtps/smtpd[8023]: lost connection after AUTH from unknown[109.120.250.112]
Mar 25 13:15:03 vps postfix/smtps/smtpd[8023]: disconnect from unknown[109.120.250.112] ehlo=1 auth=0/1 commands=1/2
Mar 25 13:15:04 vps postfix/smtp[565]: connect to w00f711e.kasserver.com[85.13.134.61]:25: Connection timed out
Mar 25 13:15:04 vps postfix/smtp[565]: D086A1462A9: to=[email protected], relay=none, delay=31902, delays=18491/13382/30/0, dsn=4.4.1, status=deferred (connect to w00f711e.kasserver.com[85.13.134.61]:25: Connection timed out)
Mar 25 13:15:04 vps postfix/smtps/smtpd[8059]: warning: c06C55BC1.dhcp.as2116.net[193.91.197.6]: SASL PLAIN authentication failed:
Mar 25 13:15:04 vps postfix/smtp[1131]: connect to mx00.kundenserver.de[212.227.15.41]:25: Connection timed out
Mar 25 13:15:04 vps postfix/smtps/smtpd[8050]: lost connection after AUTH from unknown[103.226.142.178]
Mar 25 13:15:04 vps postfix/smtps/smtpd[8050]: disconnect from unknown[103.226.142.178] ehlo=1 auth=0/1 commands=1/2
Mar 25 13:15:05 vps postfix/smtps/smtpd[8043]: warning: unknown[205.217.246.246]: SASL PLAIN authentication failed:
Mar 25 13:15:05 vps postfix/smtps/smtpd[7943]: warning: unknown[91.237.41.20]: SASL PLAIN authentication failed:
Mar 25 13:15:05 vps postfix/smtps/smtpd[7943]: lost connection after AUTH from unknown[91.237.41.20]
Mar 25 13:15:05 vps postfix/smtps/smtpd[7943]: disconnect from unknown[91.237.41.20] ehlo=1 auth=0/1 commands=1/2
Mar 25 13:15:05 vps postfix/smtp[4744]: connect to mail.jega.ch[212.74.181.129]:25: Connection timed out
Mar 25 13:15:05 vps postfix/smtp[4744]: D0D91149126: to=[email protected], relay=none, delay=69580, delays=56166/13384/30/0, dsn=4.4.1, status=deferred (connect to mail.jega.ch[212.74.181.129]:25: Connection timed out)
Mar 25 13:15:05 vps postfix/smtps/smtpd[8059]: lost connection after AUTH from c06C55BC1.dhcp.as2116.net[193.91.197.6]
Mar 25 13:15:05 vps postfix/smtps/smtpd[8059]: disconnect from c06C55BC1.dhcp.as2116.net[193.91.197.6] ehlo=1 auth=0/1 commands=1/2
same happening with me