Hello, please I have this problem. I have postfix to seding bulk mails via SMTP TLS. I cant senind bulk mails, if I send a few mails is not a problem, but if is more emails i have this problem. Example mailq: (delivery temporarily suspended: connect to alt4.gmail-smtp-in.l.google.com[74.125.28.26]:25: Connection timed out) ***@gmail.com Telnet is not working too : -------------------------------------------------------------------------------------------------------- telnet 74.125.28.26 25 Trying 74.125.28.26... telnet: Unable to connect to remote host: Connection timed out -------------------------------------------------------------------------------------------------------- telnet smtp.gmail.com Trying 74.125.133.108... telnet: Unable to connect to remote host: Connection timed out -------------------------------------------------------------------------------------------------------- There 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 = mail.*** ESMTP $mail_name (Debian/GNU) biff = no smtp_bind_address = default_destination_concurrency_limit = 10000 smtp_destination_recipient_limit = 10000 smtpd_destination_recipient_limit = 10000 # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = /usr/share/doc/postfix # TLS parameters smtpd_tls_cert_file = /etc/letsencrypt/live/****.sk/fullchain.pem smtpd_tls_key_file = /etc/letsencrypt/live/***.sk/privkey.pem smtp_tls_cert_file = /etc/letsencrypt/live/***/fullchain.pem smtp_tls_key_file = /etc/letsencrypt/live/***/privkey.pem smtpd_use_tls = yes smtp_use_tls = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_tls_protocols = !SSLv2, !SSLv3 smtp_tls_protocols = !SSLv2, !SSLv3 smtpd_tls_ciphers = high smtp_tls_ciphers = high smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth smtpd_sasl_auth_enable = yes smtp_sasl_security_options = noanonymous smtpd_tls_auth_only = yes # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. alias_maps = hash:/etc/aliases myhostname = mail.**** myorigin = /etc/mailname mydestination = localhost, proxy:mysql:/etc/postfix/mysql-mydestination.cf mynetworks = 127.0.0.0/8 [::1]/128 mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all html_directory = /usr/share/doc/postfix/html virtual_alias_domains = virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, mysql:/etc/postfix/mysql-virtual_email2email.cf virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf virtual_uid_maps = static:7000 virtual_gid_maps = static:7000 inet_protocols= ipv4 smtpd_tls_loglevel = 1 smtpd_sasl_auth_enable = yes broken_sasl_auth_clients = yes smtpd_sasl_authenticated_header = yes smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_tls_security_level = may proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $virtual_mailbox_limit_maps smtpd_client_message_rate_limit = 100 smtpd_helo_required = yes strict_rfc821_envelopes = yes disable_vrfy_command = yes transport_maps = proxy:mysql:/etc/postfix/mysql-virtual_transports.cf virtual_create_maildirsize = yes virtual_mailbox_extended = yes virtual_mailbox_limit_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailbox_limit_maps.cf virtual_mailbox_limit_override = yes virtual_maildir_limit_message = "Account is over quota" virtual_overquota_bounce = yes # OpenDKIM smtpd_milters = inet:127.0.0.1:12345 non_smtpd_milters = $smtpd_milters milter_default_action = accept virtual_transport = lmtp:unixrivate/dovecot-lmtp -------------------------------------------------------------------------------------------------------- When I delete mailq the telnet on smtp.gmail.com is working. Where can be a problem? Is possible to blocking via provider? Thank you.
unless you are whitelisted ( aka registered with returnpath or others ) chances are you can't get over a very tight limit of mails you can a) send / minute b) / hour c) to an account /time d) to a provider / time ..... yes it sucks, consider using a service like sendgrid!
I normally to use gmail smtp-relay rather than smtp. Do note that gmail has limits for sending bulk mail whether free or paid. Do google and see if you are within or already above its limit.
