Re: repeated connect and disconnect
On 07 Oct 2020, at 21:02, li...@lazygranch.com wrote: > Is there something I should be doing to mitigate this problem? Fail2ban or sshguard can both see abuse like this and firewall the IP, I believe. I would add zen to the RBL lit, but really, nothing is happening here other than annoying log lines. -- BART BUCKS ARE NOT LEGAL TENDER Bart chalkboard Ep. 8F06
Re: repeated connect and disconnect
li...@lazygranch.com skrev den 2020-10-08 05:02: Is there something I should be doing to mitigate this problem? remote can solve it by disable ehlo or starttls - Linux 3.10.0-1127.19.1.el7.x86_64 #1 SMP Tue Aug 25 17:23:54 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux how old is this kernel.
Re: repeated connect and disconnect
hello, --- Mitten drin statt nur Datei! Am 2020-10-08 11:54, schrieb Zsombor B: Just set up fail2ban, it will take care of this. Idézet (li...@lazygranch.com): Is there something I should be doing to mitigate this problem? Oct 8 02:11:42 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:43 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:43 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:43 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:44 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:45 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:45 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:45 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:46 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:46 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:46 myserver postfix/smtpd[11630]: lost connection after CONNECT from unknown[180.123.163.212] Oct 8 02:11:46 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] commands=0/0 Oct 8 02:11:46 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:47 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:47 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:47 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11630]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:48 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:50 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:53 myserver postfix/smtpd[11630]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:53 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:54 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:54 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:54 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:54 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11630]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:55 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11632]: warning: Connection rate limit exceeded: 11 from unknown[180.123.163.212] for service smtp Oct 8 02:11:55 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] commands=0/0 Oct 8 02:11:55 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11630]: warning: Connection rate limit exceeded: 12 from unknown[180.123.163.212] for service smtp Oct 8 02:11:55 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] commands=0/0 Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max connection rate 12/60s for (smtp:180.123.163.212) at Oct 8 02:11:55 Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max connection count 2 for (smtp:180.123.163.212) at Oct 8 02:11:43 Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max cache size 1 at Oct 8 02:11:42 - postconf mail_version mail_version = 3.5.7 smtpd_client_auth_rate_limit = 20 smtpd_client_connection_count_limit = 10 smtpd_client_connection_rate_limit = 10 smtpd_client_new_tls_session_rate_limit = 3 smtpd_client_recipient_rate_limit = 40 smtpd_client_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, check_reverse_client_hostname_access pcre:/etc/postfix/fqrdns.pcre, reject_unknown_reverse_client_hostname, check_client_access hash:/etc/postfix/spamsources smtpd_error_sleep_time = 2s smtpd_hard_error_limit = 6 smtpd_helo_required = yes smtpd_milters = inet:127.0.0.1:8891, inet:127.0.0.1:8893
Re: repeated connect and disconnect
Just set up fail2ban, it will take care of this. Idézet (li...@lazygranch.com): Is there something I should be doing to mitigate this problem? Oct 8 02:11:42 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:43 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:43 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:43 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:44 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:45 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:45 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:45 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:46 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:46 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:46 myserver postfix/smtpd[11630]: lost connection after CONNECT from unknown[180.123.163.212] Oct 8 02:11:46 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] commands=0/0 Oct 8 02:11:46 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:47 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:47 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:47 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11630]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:48 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:50 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:53 myserver postfix/smtpd[11630]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:53 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:54 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:54 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:54 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:54 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11630]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:55 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11632]: warning: Connection rate limit exceeded: 11 from unknown[180.123.163.212] for service smtp Oct 8 02:11:55 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] commands=0/0 Oct 8 02:11:55 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11630]: warning: Connection rate limit exceeded: 12 from unknown[180.123.163.212] for service smtp Oct 8 02:11:55 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] commands=0/0 Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max connection rate 12/60s for (smtp:180.123.163.212) at Oct 8 02:11:55 Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max connection count 2 for (smtp:180.123.163.212) at Oct 8 02:11:43 Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max cache size 1 at Oct 8 02:11:42 - postconf mail_version mail_version = 3.5.7 smtpd_client_auth_rate_limit = 20 smtpd_client_connection_count_limit = 10 smtpd_client_connection_rate_limit = 10 smtpd_client_new_tls_session_rate_limit = 3 smtpd_client_recipient_rate_limit = 40 smtpd_client_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, check_reverse_client_hostname_access pcre:/etc/postfix/fqrdns.pcre, reject_unknown_reverse_client_hostname, check_client_access hash:/etc/postfix/spamsources smtpd_error_sleep_time = 2s smtpd_hard_error_limit = 6 smtpd_helo_required = yes smtpd_milters = inet:127.0.0.1:8891, inet:127.0.0.1:8893 smtpd_recipient_limit = 20 smtpd_recipient_restrictions = permit_sasl_authenticated,
Re: repeated connect and disconnect
Dnia 7.10.2020 o godz. 20:02:02 li...@lazygranch.com pisze: > Is there something I should be doing to mitigate this problem? Firewall out IPs that show such behaviour? It's what I usually do... -- Regards, Jaroslaw Rafa r...@rafa.eu.org -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub."
Re: repeated connect and disconnect
On Wed, Oct 07, 2020 at 08:02:02PM -0700, li...@lazygranch.com wrote: > Is there something I should be doing to mitigate this problem? > > Oct 8 02:11:42 myserver postfix/smtpd[11630]: connect from > unknown[180.123.163.212] Were you expecting email from the below network? If not, you don't need to worry about bots checking out your MTA. [ Not all bots are bad, my DANE survey bot will connect to your MX hosts ~once a day to each MX host IP address (for those MX hosts that have DANE TLSA records), but it will politely send "QUIT" after STARTTLS[1] and a post-TLS EHLO. ] inetnum:180.96.0.0 - 180.127.255.255 netname:CHINANET-JS descr: Chinanet Jiangsu Province Network descr: China Telecom descr: No.31,jingrong street descr: Beijing 100032 country:CN admin-c:CH93-AP tech-c: CJ186-AP remarks:service provider status: ALLOCATED PORTABLE remarks: remarks:To report network abuse, please contact mnt-irt remarks:For troubleshooting, please contact tech-c and admin-c remarks:Report invalid contact via www.apnic.net/invalidcontact remarks: mnt-by: APNIC-HM mnt-lower: MAINT-CHINANET-JS last-modified: 2016-05-04T00:18:52Z source: APNIC mnt-irt:IRT-CHINANET-CN irt:IRT-CHINANET-CN address:No.31 ,jingrong street,beijing address:100032 e-mail: anti-s...@ns.chinanet.cn.net abuse-mailbox: anti-s...@ns.chinanet.cn.net admin-c:CH93-AP tech-c: CH93-AP auth: # Filtered mnt-by: MAINT-CHINANET last-modified: 2010-11-15T00:31:55Z source: APNIC role: CHINANET JIANGSU address:260 Zhongyang Road,Nanjing 210037 country:CN phone: +86-25-86588231 phone: +86-25-86588745 fax-no: +86-25-86588104 e-mail: jsab...@189.cn remarks:send anti-spam reports to jsab...@189.cn remarks:send abuse reports to jsab...@189.cn remarks:times in GMT+8 remarks:www.jsinfo.net admin-c:CH360-AP tech-c: CS306-AP tech-c: CN142-AP nic-hdl:CJ186-AP notify: jsab...@189.cn mnt-by: MAINT-CHINANET-JS last-modified: 2020-04-02T09:18:02Z source: APNIC person: Chinanet Hostmaster nic-hdl:CH93-AP e-mail: anti-s...@ns.chinanet.cn.net address:No.31 ,jingrong street,beijing address:100032 phone: +86-10-58501724 fax-no: +86-10-58501724 country:CN mnt-by: MAINT-CHINANET last-modified: 2014-02-27T03:37:38Z source: APNIC -- Viktor. [1] https://stats.dnssec-tools.org/about.html If so, you'll see log entries like: Oct 7 15:23:51 amnesiac postfix/smtpd[94878]: connect from dnssec-stats.ant.isi.edu[128.9.29.254] Oct 7 15:23:52 amnesiac postfix/smtpd[94878]: Anonymous TLS connection established from dnssec-stats.ant.isi.edu[128.9.29.254]: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256 Oct 7 15:23:52 amnesiac postfix/smtpd[94878]: disconnect from dnssec-stats.ant.isi.edu[128.9.29.254] ehlo=2 starttls=1 quit=1 commands=4 Oct 7 15:23:53 amnesiac postfix/smtpd[94878]: connect from dnssec-stats.ant.isi.edu[2001:1878:401::8009:1dfe] Oct 7 15:23:54 amnesiac postfix/smtpd[94878]: Anonymous TLS connection established from dnssec-stats.ant.isi.edu[2001:1878:401::8009:1dfe]: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256 Oct 7 15:23:54 amnesiac postfix/smtpd[94878]: disconnect from dnssec-stats.ant.isi.edu[2001:1878:401::8009:1dfe] ehlo=2 starttls=1 quit=1 commands=4
Re: repeated connect and disconnect
On Thu, 8 Oct 2020 at 04:03, li...@lazygranch.com wrote: > > Is there something I should be doing to mitigate this problem? > > Oct 8 02:11:42 myserver postfix/smtpd[11630]: connect from > unknown[180.123.163.212] > Oct 8 02:11:43 myserver postfix/smtpd[11632]: connect from > unknown[180.123.163.212] > Oct 8 02:11:43 myserver postfix/smtpd[11632]: lost connection after EHLO > from unknown[180.123.163.212] > Oct 8 02:11:43 myserver postfix/smtpd[11632]: disconnect from > unknown[180.123.163.212] ehlo=1 commands=1 > ... > Oct 8 02:11:55 myserver postfix/smtpd[11632]: warning: Connection rate limit > exceeded: 11 from unknown[180.123.163.212] for service smtp > Oct 8 02:11:55 myserver postfix/smtpd[11632]: disconnect from > unknown[180.123.163.212] commands=0/0 > Oct 8 02:11:55 myserver postfix/smtpd[11630]: connect from > unknown[180.123.163.212] > Oct 8 02:11:55 myserver postfix/smtpd[11630]: warning: Connection rate limit > exceeded: 12 from unknown[180.123.163.212] for service smtp > Oct 8 02:11:55 myserver postfix/smtpd[11630]: disconnect from > unknown[180.123.163.212] commands=0/0 > Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max connection > rate 12/60s for (smtp:180.123.163.212) at Oct 8 02:11:55 > Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max connection > count 2 for (smtp:180.123.163.212) at Oct 8 02:11:43 > Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max cache size 1 > at Oct 8 02:11:42 smtpd is doing what you told it to and apart from the crud in the log I don't think there is a problem. But otherwise, use postscreen + RBLs? This ip address is blocklisted by many RBLs, including zen.spamhaus.org.
repeated connect and disconnect
Is there something I should be doing to mitigate this problem? Oct 8 02:11:42 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:43 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:43 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:43 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:44 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:45 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:45 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:45 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:46 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:46 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:46 myserver postfix/smtpd[11630]: lost connection after CONNECT from unknown[180.123.163.212] Oct 8 02:11:46 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] commands=0/0 Oct 8 02:11:46 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:47 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:47 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:47 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11630]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:48 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:48 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:50 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:53 myserver postfix/smtpd[11630]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:53 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:54 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:54 myserver postfix/smtpd[11632]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:54 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:54 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11630]: lost connection after EHLO from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] ehlo=1 commands=1 Oct 8 02:11:55 myserver postfix/smtpd[11632]: connect from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11632]: warning: Connection rate limit exceeded: 11 from unknown[180.123.163.212] for service smtp Oct 8 02:11:55 myserver postfix/smtpd[11632]: disconnect from unknown[180.123.163.212] commands=0/0 Oct 8 02:11:55 myserver postfix/smtpd[11630]: connect from unknown[180.123.163.212] Oct 8 02:11:55 myserver postfix/smtpd[11630]: warning: Connection rate limit exceeded: 12 from unknown[180.123.163.212] for service smtp Oct 8 02:11:55 myserver postfix/smtpd[11630]: disconnect from unknown[180.123.163.212] commands=0/0 Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max connection rate 12/60s for (smtp:180.123.163.212) at Oct 8 02:11:55 Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max connection count 2 for (smtp:180.123.163.212) at Oct 8 02:11:43 Oct 8 02:15:15 myserver postfix/anvil[11633]: statistics: max cache size 1 at Oct 8 02:11:42 - postconf mail_version mail_version = 3.5.7 smtpd_client_auth_rate_limit = 20 smtpd_client_connection_count_limit = 10 smtpd_client_connection_rate_limit = 10 smtpd_client_new_tls_session_rate_limit = 3 smtpd_client_recipient_rate_limit = 40 smtpd_client_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, check_reverse_client_hostname_access pcre:/etc/postfix/fqrdns.pcre, reject_unknown_reverse_client_hostname, check_client_access hash:/etc/postfix/spamsources smtpd_error_sleep_time = 2s smtpd_hard_error_limit = 6 smtpd_helo_required = yes smtpd_milters = inet:127.0.0.1:8891, inet:127.0.0.1:8893 smtpd_recipient_limit = 20 smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_unauth_pipelining, reject_non_fqdn_sender, reject_unknown_sender_domain,
