Hello,

We are using postfix without authenticacion and works correctly, but my company now requires smtp user/password.

I have configurated password file in /etc/postfix/sasl_passwd

[smtp.domain1.com]:1025 app1@emaildomain.com:password

When i try to send email i got this message on log: to=<destinationmail@emaildomain.com>, relay=none, delay=0.01, delays=0/0/0/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=emaildomain.com type=A: Host found but no data record of requested type)

emaildomain.com is not a DNS zone and you cant resolve it, but we can use it on this server without smtp authenticacion and in another servers with outlook for example.

This is my main.cf:

# See /usr/share/postfix/main.cf.dist for a commented, more complete version

# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
# fresh installs.
compatibility_level = 2

# TLS parameters
# smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
# smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
# smtpd_tls_security_level=may
# smtp_tls_CApath=/etc/ssl/certs
# smtp_tls_security_level=may
# smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache


# smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
# myhostname = Servername
 alias_maps = hash:/etc/aliases
 alias_database = hash:/etc/aliases
 myorigin = /etc/mailname
 mydestination = $myhostname, localhost, Servername, emaildomain.com
 relayhost = =smtp.domain1.com]:1025
 smtp_use_tls = yes
 smtp_sasl_auth_enable = yes
 smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
 smtp_tls_CAfile = /etc/ssl/certs/ca-bundle.crt
 smtp_sasl_security_options = noanonymous
 smtp_sasl_tls_security_options = noanonymous
 mynetworks = 127.0.0.0/8 8::ffff:127.0.0.0]/104 4::1]/128 ourIPrange
 mailbox_command = procmail -a "$EXTENSION"
 mailbox_size_limit = 0
 recipient_delimiter = +
 inet_interfaces = all
 inet_protocols = ipv4

This is mail.log

postfix/cleanupu2526328]: 51D0F803D6: message-id=<20240730092806.51D0F803D6@SERVERNAME.localdomain>
postfix/qmgrg2526323]: 51D0F803D6: from=<root@SERVERNAME.localdomain>, size=456, nrcpt=1 (queue active)
postfix/smtpt2526335]: 51D0F803D6: to=<destinationmail@emaildomain.com>, relay=none, delay=0.01, delays=0/0/0/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=emaildomain.com type=A: Host found but no data record of requested type)
postfix/cleanupu2526328]: 553E0803D8: message-id=<20240730092806.553E0803D8@SERVERNAME.localdomain>
postfix/bouncec2526336]: 51D0F803D6: sender non-delivery notification: 553E0803D8

why are you not using relay if it is in the main.cf ?

Thanks,