hello all, this is the same server, same situation for which I asked for help yesterday. Right now, after trying to test and follow up the advice received, this is the status:
IMAPS: not working yet because of SSL "no shared cipher". Details here: https://dovecot.org/pipermail/dovecot/2018-December/113862.html POSTFIX: with the current configuration (see postconf -n output below) it seems I can: * receive email from all the mailing lists/newsletters I am subscribed to * connect with mutt from my home computer, and send email through this server to any other MTA I could use for testing, with two "exceptions": gmail still refuses connection, see below what I got from the last test a few minutes ago one server does accepts and deliver my messages, but flags them as spam (no idea why, all I see is a "X-Spam-Flag: YES" header... NOTIFICATION BY GMAIL: <marco.fiore...@gmail.com>: host gmail-smtp-in.l.google.com[2a00:1450:400c:c0c::1b] said: 550-5.7.1 [XXXXXXXXXXXX] Our system has detected that this message does 550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and 550-5.7.1 authentication. Please review 550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information 550 5.7.1 . t6si9122052wrw.74 - gsmtp (in reply to end of DATA command) Fact is, "XXXXXXXXXXXX" is the ipv6 address of the server for which I *did* add a reverse entry some hours ago (and I had done the same for the ipv4 dns record yesterday). In other words, I don't know what else I could / should do at this point on the DNS side. Here is the output of postconf -n: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin xxgdb $daemon_directory/$process_name $process_id & sleep 5 disable_vrfy_command = yes html_directory = /usr/share/doc/postfix-2.4.3-documentation/html inet_interfaces = all mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost mydomain = $myhostname myhostname = a.mx.MYDOMAIN mynetworks = 127.0.0.0/8, my.home.ip.address myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix non_smtpd_milters = inet:localhost:8891 procmail_destination_recipient_limit = 1 queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.4.3-documentation/readme relay_domains = sample_directory = /etc/postfix sender_dependent_relayhost_maps = hash:/etc/postfix/mymaps/relayhost_maps sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_sasl_auth_enable = yes smtp_sasl_mechanism_filter = smtp_sasl_password_maps = hash:/etc/postfix/mymaps/sasl_passwd smtp_sasl_security_options = noanonymous smtp_sasl_tls_security_options = noanonymous smtp_sasl_type = cyrus smtp_sender_dependent_authentication = yes smtp_tls_security_level = may smtpd_helo_required = yes smtpd_helo_restrictions = smtpd_milters = inet:localhost:8891 smtpd_recipient_restrictions = reject_invalid_hostname, reject_non_fqdn_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unknown_sender_domain, reject_unknown_recipient_domain, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_helo_access hash:/etc/postfix/reject_own_helo, check_policy_service unix:postgrey/socket smtpd_sasl_auth_enable = yes smtpd_sasl_path = /var/spool/postfix/private/auth smtpd_sasl_type = dovecot smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/letsencrypt/archive/MYDOMAIN/fullchain1.pem smtpd_tls_key_file = /etc/letsencrypt/archive/MYDOMAIN/privkey1.pem smtpd_tls_loglevel = 1 smtpd_tls_security_level = may strict_rfc821_envelopes = yes unknown_address_reject_code = 554 unknown_client_reject_code = 554 unknown_hostname_reject_code = 554 unknown_local_recipient_reject_code = 550 virtual_alias_maps = hash:/etc/postfix/mymaps/valias.map virtual_gid_maps = static:5000 virtual_mailbox_base = /var/mail/mymail_storage virtual_mailbox_domains = /etc/postfix/mymaps/vhosts.map virtual_mailbox_maps = hash:/etc/postfix/mymaps/vmailboxes.map virtual_transport = procmail virtual_uid_maps = static:5000 postconf: warning: /etc/postfix/main.cf: unused parameter: smtp_tls_auth_only=yes
