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http://www.postfix.org/DEBUG_README.html
Postfix version 2.1 and later can produce mail delivery reports for debugging purposes. These reports not only show sender/recipient addresses after address rewriting and alias expansion or forwarding, they also show information about delivery to mailbox, delivery to non-Postfix command, responses from remote SMTP servers, and so on.
https://easyengine.io/tutorials/mail/postfix-debugging/
Oct 14, 2013 · You will need to debug postfix, when you are facing email related issues like emails are not sent, emails are delivered but with a long delay, mail bounces, etc. In this article, we will first see how we can check if postfix itself can send emails. Then we will see postfix configuration/re-configuration and some related parameter.
http://web.mit.edu/netbsd/src/gnu/dist/postfix/proto/DEBUG_README.html
With Postfix version 2.1 and later you can ask Postfix to produce mail delivery reports for debugging purposes. These reports not only show sender/recipient addresses after address rewriting and alias expansion or forwarding, they also show information about delivery to mailbox, delivery to non-Postfix command, responses from remote SMTP servers, and so on.
https://access.redhat.com/solutions/70539
debug_peer_level = 10 debug_peer_list = 127.0.0.1 debug_peer_list = example.domain if you need some procedure in each components of postfix (smtpd, cleanup,smtp and so on...), you can add -v on /etc/postfix/master.cf file.
https://docs.iredmail.org/debug.postfix.html
Turn on debug mode in Postfix. There're few ways to turn on debug mode in Postfix, you can choose the one you prefer. Verbose logging for specific SMTP connections. To debug smtp connection from particular client or sender server, list client hostname or IP address in the debug_peer_list parameter (in /etc/postfix/main.cf). For example:
https://ubuntu.com/server/docs/mail-postfix
If this is the case it may be easier to use the above commands to configure Postfix for SMTP-AUTH than to use mail-stack-delivery. To install the package, from a terminal prompt enter: sudo apt install mail-stack-delivery
http://postfix.1071664.n5.nabble.com/Mail-Delivery-Status-report-td101590.html
> Postfix can produce two types of mail delivery reports for debugging: > > • What-if: report what would happen, but do not actually deliver mail. This mode of operation is requested with: > > % /usr/sbin/sendmail -bv address... > > Mail Delivery Status Report will …
https://serverfault.com/questions/973387/postfix-delivery-failure
smtps inet n - n - - smtpd -v -o syslog_name=postfix/smtps -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes -o smtpd_reject_unlisted_recipient=no Then, remove your insecure smtpd_sasl_auth_enable and smtpd_sasl_security_options in your main.cf - since you probably do NOT want to allow mail clients to deliver authenticated mail on port 25, only on the two submission ports …
http://www.postfix.org/postconf.5.html
Report mail delivery errors to the address specified with the non-standard Errors-To: message header, instead of the envelope sender address (this feature is removed with Postfix version 2.2, is turned off by default with Postfix version 2.1, and is always turned on with older Postfix versions).
https://help.ubuntu.com/lts/serverguide/postfix.html
Another option for configuring Postfix for SMTP-AUTH is using the mail-stack-delivery package (previously packaged as dovecot-postfix). This package will install Dovecot and configure Postfix to use it for both SASL authentication and as a Mail Delivery Agent (MDA).
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