Solved
Many thanks to *Wietse Venema*
The solution could be as simple as:

/etc/postfix/main.cf:
    smtp_sasl_mechanism_filter = login plain



Nuno Catarino <nuno.catar...@espamol.pt> escreveu (quarta, 28/02/2024 à(s)
15:04):

> Hi there, i'm using leap 15.5, trying to send emails thru gmail relay and
> getting crazy.
> Send my configuration for someone to help me
> when i'm trying to send the email the error is:
>
> postfix/pickup[30145]: CFC982C034E: uid=0 from=<root>
> postfix/cleanup[30149]: CFC982C034E:
> message-id=<20240228100831.CFC982C034E@localhost>
> postfix/qmgr[30144]: CFC982C034E: from=<root@localhost>, size=428,
> nrcpt=1 (queue active)
> postfix/smtp[31278]: CFC982C034E: to=<em...@gmail.com>, relay=
> smtp.gmail.com[64.233.167.109]:587, delay=5.5, delays=0.05/0/5.4/0,
> dsn=4.7.0, status=deferred (SASL authentication failed; cannot authenticate
> to server smtp.gmail.com[64.233.167.109]: invalid parameter supplied)
>
> *In the gmail account i have created a apps password*
>
> *In the file /etc/postfix/sasl_passwd*
> [smtp.gmail.com]:587 nuno.catar...@xxxx.pt:zzzz zzzz zzzz zzzz
>
>
>
> *the result of the commandpostmap -q “[smtp.gmail.com
> <http://smtp.gmail.com>]:587” lmdb:/etc/postfix/sasl_passwdis:*
> nuno.catar...@xxxx.pt:zzzz zzzz zzzz zzzz
>
>
>
> *I did thepostmap /etc/postfix/sasl_passwdand restarted the postfix
> service*
>
> *The configuration file /etc/postfix/master.cf <http://master.cf>*
> is
>
> smtp      inet  n       -       n       -       -       smtpd
> pickup    fifo  n       -       n       60      1       pickup
> cleanup   unix  n       -       n       -       0       cleanup
> qmgr      fifo  n       -       n       300     1       qmgr
> #qmgr     fifo  n       -       n       300     1       oqmgr
> tlsmgr    unix  -       -       n       1000?   1       tlsmgr
> rewrite   unix  -       -       n       -       -       trivial-rewrite
> bounce    unix  -       -       n       -       0       bounce
> defer     unix  -       -       n       -       0       bounce
> trace     unix  -       -       n       -       0       bounce
> verify    unix  -       -       n       -       1       verify
> flush     unix  n       -       n       1000?   0       flush
> proxymap  unix  -       -       n       -       -       proxymap
> proxywrite unix -       -       n       -       1       proxymap
> smtp      unix  -       -       n       -       -       smtp
> relay     unix  -       -       n       -       -       smtp
> #       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
> showq     unix  n       -       n       -       -       showq
> error     unix  -       -       n       -       -       error
> retry     unix  -       -       n       -       -       error
> discard   unix  -       -       n       -       -       discard
> local     unix  -       n       n       -       -       local
> virtual   unix  -       n       n       -       -       virtual
> lmtp      unix  -       -       n       -       -       lmtp
> anvil     unix  -       -       n       -       1       anvil
> scache    unix  -       -       n       -       1       scache
> postlog   unix-dgram n  -       n       -       1       postlogd
>
> *result of the command postconf -n*
>
> alias_maps = lmdb:/etc/aliases
> biff = no
> canonical_maps = lmdb:/etc/postfix/canonical
> command_directory = /usr/sbin
> compatibility_level = 3.6
> content_filter =
> daemon_directory = /usr/lib/postfix/bin/
> data_directory = /var/lib/postfix
> debug_peer_level = 2
> debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd
> $daemon_directory/$process_name $process_id & sleep 5
> defer_transports =
> delay_warning_time = 1h
> disable_dns_lookups = no
> disable_mime_output_conversion = no
> disable_vrfy_command = yes
> html_directory = /usr/share/doc/packages/postfix-doc/html
> inet_interfaces = localhost
> inet_protocols = ipv4
> mail_owner = postfix
> mail_spool_directory = /var/mail
> mailbox_command =
> mailbox_size_limit = 0
> mailbox_transport =
> mailq_path = /usr/bin/mailq
> manpage_directory = /usr/share/man
> masquerade_classes = envelope_sender, header_sender, header_recipient
> masquerade_domains =
> masquerade_exceptions = root
> message_size_limit = 0
> message_strip_characters = \0
> mydestination = $myhostname, localhost.$mydomain
> myhostname = localhost
> mynetworks_style = subnet
> newaliases_path = /usr/bin/newaliases
> queue_directory = /var/spool/postfix
> readme_directory = /usr/share/doc/packages/postfix-doc/README_FILES
> relay_clientcerts =
> relay_domains = $mydestination, lmdb:/etc/postfix/relay
> relayhost = [smtp.gmail.com]:587
> relocated_maps = lmdb:/etc/postfix/relocated
> sample_directory = /usr/share/doc/packages/postfix-doc/samples
> sender_canonical_maps = lmdb:/etc/postfix/sender_canonical
> sendmail_path = /usr/sbin/sendmail
> setgid_group = maildrop
> smtp_enforce_tls = no
> smtp_sasl_auth_enable = yes
> smtp_sasl_password_maps = lmdb:/etc/postfix/sasl_passwd
> smtp_sasl_security_options =
> smtp_tls_CAfile = /etc/ssl/ca-bundle.pem
> smtp_tls_CApath =
> smtp_tls_cert_file =
> smtp_tls_key_file =
> smtp_tls_session_cache_database =
> smtp_use_tls = yes
> smtpd_banner = $myhostname ESMTP
> smtpd_client_restrictions =
> smtpd_delay_reject = yes
> smtpd_helo_required = no
> smtpd_helo_restrictions =
> smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination
> smtpd_sasl_auth_enable = no
> smtpd_sender_restrictions = lmdb:/etc/postfix/access
> smtpd_tls_CAfile =
> smtpd_tls_CApath =
> smtpd_tls_ask_ccert = no
> smtpd_tls_cert_file =
> smtpd_tls_key_file =
> smtpd_tls_received_header = no
> smtpd_use_tls = no
> strict_8bitmime = no
> strict_rfc821_envelopes = no
> transport_maps = lmdb:/etc/postfix/transport
> unknown_local_recipient_reject_code = 550
> virtual_alias_domains = lmdb:/etc/postfix/virtual
> virtual_alias_maps = lmdb:/etc/postfix/virtual
>
>
> *Result of the commandsystemctl status postfix.service*
>
> postfix.service - Postfix Mail Transport Agent
>      Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled;
> vendor preset: enabled)
>      Active: active (running) since Tue 2024-02-27 17:03:12 WET; 17h ago
>     Process: 28975 ExecStartPre=/bin/echo Starting mail service (Postfix)
> (code=exited, status=0/SUCCESS)
>     Process: 28976 ExecStartPre=/usr/lib/postfix/systemd/config_postfix
> (code=exited, status=0/SUCCESS)
>     Process: 28977 ExecStartPre=/usr/lib/postfix/systemd/update_chroot
> (code=exited, status=0/SUCCESS)
>     Process: 28978 ExecStartPre=/usr/lib/postfix/systemd/update_postmaps
> (code=exited, status=0/SUCCESS)
>     Process: 28990 ExecStart=/usr/sbin/postfix start (code=exited,
> status=0/SUCCESS)
>     Process: 29062 ExecStartPost=/usr/lib/postfix/systemd/wait_qmgr 60
> (code=exited, status=0/SUCCESS)
>     Process: 29069 ExecStartPost=/usr/lib/postfix/systemd/cond_slp
> register (code=exited, status=0/SUCCESS)
>    Main PID: 29059 (master)
>       Tasks: 8 (limit: 4915)
>      CGroup: /system.slice/postfix.service
>              ├─ 29059 /usr/lib/postfix/bin//master -w
>              ├─ 30144 qmgr -l -t fifo -u
>              ├─ 30145 pickup -l -t fifo -u
>              ├─ 30149 cleanup -z -t unix -u
>              ├─ 30150 trivial-rewrite -n rewrite -t unix -u
>              ├─ 30152 tlsmgr -l -t unix -u
>              ├─ 30165 local -t unix
>              └─ 31278 smtp -t unix -u
>
> Thx in advance
>
>
>
>
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