smtpd_sasl_auth_enable=yes - SERP Analysis

https://www.postfix.org/SASL_README.html

https://forums.rockylinux.org/t/postfix-smtpd-sasl-auth-enable-yes-no-working/15677

https://serverfault.com/questions/691795/how-to-force-postfix-smtp-to-use-auth-sasl-and-reject-anonymous-connections

https://doc.dovecot.org/configuration_manual/howto/postfix_and_dovecot_sasl/

https://docs.iredmail.org/enable.smtp.auth.on.port.25.html

https://www.postfix.org/postconf.5.html

https://www.vanimpe.eu/2021/05/11/postfix-with-client-authentication/

https://wiki.debian.org/PostfixAndSASL

https://forums.zimbra.org/viewtopic.php?t=67862

https://www.linode.com/docs/guides/postfix-smtp-debian7/

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/security_guide/sect-security_guide-securing_postfix-configuring_postfix_to_use_sasl

https://github.com/saltstack-formulas/postfix-formula/issues/103

https://talk.plesk.com/threads/postfix-smtp-sasl-authentication-failure.279099/

https://forum.efa-project.org/viewtopic.php?t=5342

https://help.univention.com/t/smtp-mail-shipping-doesnt-work-sasl-authentication-failed/10313

https://sites.google.com/site/linuxscooter/linux/mail/postfix-smtp-authentication

https://annvix.com/enabling_sasl_in_postfix

https://www.linuxquestions.org/questions/linux-security-4/%5Bpostfix-smtpd%5D-getting-no-auth-from-server%3B-open-relay-257703/

https://community.grommunio.com/d/1861-postfix-and-smtp-auth-with-saslauthd-will-not-work

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/deploying_mail_servers/assembly_mail-transport-agent_deploying-mail-servers

https://github.com/docker-mailserver/docker-mailserver/issues/1796

https://documentation.ubuntu.com/server/how-to/mail-services/install-postfix/

http://proger.i-forge.net/Setting_up_SMTP_authorization_for_Postfix_using_Cyrus_SASL/clm

https://www.faqforge.com/linux/how-to-enable-port-587-submission-in-postfix/

https://forum.virtualmin.com/t/autoconfig-not-enforcing-ssl-tls-for-smtp/105552

https://think.unblog.ch/en/how-to-use-postfix-sasl-authentication/

https://mirror.math.princeton.edu/pub/postfix/SASL_README.html

https://www.reddit.com/r/linuxquestions/comments/1oq798/postfix_configuration_craziness/

https://www.iwader.co.uk/posts/2014/05/postfix-force-smtp-authentication/

https://talk.plesk.com/threads/smtpd-no-auth-from-ip-issue.371467/

https://sysadmins.co.za/setup-smtp-authentication-with-tls-ssl-on-postfix/

https://forums.opensuse.org/t/postfix-sasl-authentication/133072

https://mailing.postfix.users.narkive.com/C904MTcY/postfix-not-doing-smtp-client-authentication

https://bbs.archlinux.org/viewtopic.php?id=165665

https://www.howtoforge.com/postfix-smtp-authentication-on-the-secure-port-only

https://stackoverflow.com/questions/43931621/not-able-to-authenticate-smtp-clients-on-debianpostfixsasl-with-rimap

https://www.vmadmin.co.uk/linux/44-redhat/146-linuxpostfix

https://forums.opensuse.org/t/postfix-sending-of-mail-impossible/103506

https://wiki.archlinux.org/title/Postfix_with_SASL

https://forum.virtualmin.com/t/postfix-sasl-authentication-failed/57057

http://www.seismo.ethz.ch/static/linux/postfix_smtp_auth.html

https://www.linode.com/community/questions/22043/postfix-smtp-authentication

http://www.linux-admins.net/2020/03/postfix-as-sasl-authenticated-tls.html

https://forum.howtoforge.com/threads/postfix-smtp-auth-tls-broken.16090/

https://linux-svr.com/%E3%83%A1%E3%83%BC%E3%83%AB%E3%82%B5%E3%83%BC%E3%83%90/19.php

https://learn.microsoft.com/en-us/answers/questions/1293429/postfix-takes-25-port-instead-of-587

https://postfix.cs.utah.edu/SASL_README.html

https://subatomicsolutions.org/postfix-smtp-email-server

https://superuser.com/questions/1506138/postfix-cyrus-not-working

https://bobcares.com/blog/postfix-authentication-not-enabled/

https://alt.comp.mail.postfix.narkive.com/VPxRNB45/setting-up-smpts-relaying

https://oper.io/?p=linux/security/Securing_a_Postfix_Smtp_Server

https://forum.iredmail.org/topic4954-how-to-disable-smtp-auth-in-iredmail.html

https://community.grommunio.com/d/383-no-smtp-auth-on-smtp-submission-due-to-saslauth-not-available

https://www.hahnjo.de/blog/2021/05/02/postfix-authorization.html

https://blog.iwayvietnam.com/tuanta/2008/10/configure-postfix-for-authenticated-simple-mail-transfer-protocol-smtp/

https://askubuntu.com/questions/562097/postfix-sasl-authentification-not-applied

https://www.cs.ait.ac.th/~on/postfix/SASL_README.html

https://www.linuxtopia.org/online_books/mail_systems/postfix_documentation/SASL_README_006.html

https://qiita.com/yoshidna/items/2d0b89086914a7be73a4

https://postfix.traduc.org/index.php/SASL_README.html

https://unix.stackexchange.com/questions/632401/postfix-cyrus-sasl-authentication

http://www.serpentine.com/blog/2005/01/30/configuring-postfix-to-use-tls-and-smtp-auth/

https://arstechnica.com/civis/threads/postfix-smtp-auth-with-tls-and-sasl-problems-long-post.521941/

https://www.mail-archive.com/search?l=misc%40openbsd.org&q=subject:%22Re%5C%3A%2Bproblem%2Bbetween%2Bpostfix%2Band%2BCourier%2Bauthdaemond%22&o=newest&f=1

https://www.postfix-jp.info/trans-2.3/jhtml/SASL_README.html

https://superuser.com/questions/904669/how-turn-on-smtp-authentication

https://systemrequest.net/29/

https://www.bigbang.mydns.jp/smtpauth-x.htm

https://www.1x1.jp/blog/2012/10/postfix_and_cyrus_sasl2_stmp_auth.html

https://blog.mediendezign.com/postfix-mit-smtp-auth/

https://www.linux.org.ru/forum/admin/420552

https://centossrv.com/postfix.shtml

https://wiki.hgotoh.jp/documents/mail/mail-010

https://we.riseup.net/wikis/3450

https://www.instructables.com/Using-SMTP-and-SASL-with-Postfix-when-your-ISP-won/

https://www.lunanode.com/guides/postfix_smtp_secure