Le 24/06/2021 à 17:04, Matus UHLAR - fantomas a écrit :
On 24.06.21 16:55, Matus UHLAR - fantomas wrote:

relayhost = [mail.'external host']:587
http://www.postfix.org/postconf.5.html#relayhost

and apparently configure SMTP Authentication by using:

smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_auth_enable = yes
smtp_sasl_tls_security_options = noanonymous
smtp_tls_security_level=encrypt

and put '[mail.'external host']    user:password'

sorry, this had to be:

[mail.'external host']:587        user:password

(removed apostrophes and added :port)

into /etc/postfix/sasl_passwd
http://www.postfix.org/postconf.5.html#smtp_sasl_password_maps

On 24.06.21 17:40, Jean-François Bachelet wrote:
well with this kind of config I finally get mails to be sent outside the server to 'customer@anywhere' by the 587 port. that's better.


BTW, the received mail says coming from 'root'@mydomain and not as expected webmaster@mydomain :(

Whoever submits the mail, is supposed to set the sender. Othwerise, the
sending user is set from active user which is 0==root.

the root = webmaster@mydomain exists in the aliases file so why ? wxhat to change in  where config file to change that ?

aliases map recipients, not senders, see:
http://www.postfix.org/canonical.5.html

then the test mail meant to be sent to webmaster@mydomain is still not delivered :( error is still webmaster : user don't exists

yes, because the mail is handled locally - your postfix thinks it handles
mail for "mydomain". If "mydomain" is to be handled by remote server, you
must not set it as local.

mails to that address from the postfix server just 'vanishes' I find it nowhere on the server, nor in root mailbox nor user mailbox nor /var/spool/ or /var/mail...

don't know where it go

it was dropped as neither recipient, nor the sender (recipient for
non-delivery notifiaction) was deliverable.

Jun 24 17:12:45 amiga postfix/pickup[32154]: 8E5011C80B28: uid=0 from=<root@mydomain> Jun 24 17:12:45 amiga postfix/cleanup[32161]: 8E5011C80B28: message-id=<20210624151245.8E5011C80B28@mail.mydomain> Jun 24 17:12:45 amiga postfix/qmgr[32155]: 8E5011C80B28: from=<root@mydomain>, size=357, nrcpt=1 (queue active) Jun 24 17:12:45 amiga postfix/local[32164]: 8E5011C80B28: to=<webmaster@mydomain>, relay=local, delay=0.14, delays=0.09/0.01/0/0.05, dsn=5.1.1, status=bounced (unknown user: "webmaster") Jun 24 17:12:45 amiga postfix/cleanup[32161]: A77451C80B40: message-id=<20210624151245.A77451C80B40@mail.mydomain> Jun 24 17:12:45 amiga postfix/bounce[32165]: 8E5011C80B28: sender non-delivery notification: A77451C80B40 Jun 24 17:12:45 amiga postfix/qmgr[32155]: A77451C80B40: from=<>, size=2258, nrcpt=1 (queue active)
Jun 24 17:12:45 amiga postfix/qmgr[32155]: 8E5011C80B28: removed
Jun 24 17:12:45 amiga postfix/local[32164]: A77451C80B40: to=<webmaster@mydomain>, orig_to=<root@mydomain>, relay=local, delay=0.07, delays=0.03/0/0/0.03, dsn=5.1.1, status=bounced (unknown user: "webmaster")
Jun 24 17:12:45 amiga postfix/qmgr[32155]: A77451C80B40: removed

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