On 2025-12-06 at 16:35:18 UTC-0500 (Sat, 6 Dec 2025 21:35:18 +0000)
Linkcheck via Postfix-users <[email protected]>
is rumored to have said:

Sorry, I missed that point. There were NO entries in the logs pertaining to gmail failures.

Which indicates that GMail didn't even connect to attempt a delivery.

This suggests that the problem is in the DNS of the recipient domain(s), which I don't see stated clearly.

I don't see any problem with the relevant DNS for the visible domains. I don't see any reason for a sending server to not even attempt to give you mail for ssph.org.uk, bristolweb.net, or linkcheck.co.uk.

If you have a bounce message generated by GMail, it may provide more useful information.

The output from postconf -nf

2bounce_notice_recipient = [email protected]
address_verify_map = proxy:btree:/var/lib/postfix/verify_cache
address_verify_sender_ttl = 237m
alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
append_dot_mydomain = no
biff = no
body_checks = pcre:/etc/postfix/body_checks.pcre
bounce_notice_recipient = [email protected]
bounce_queue_lifetime = 5d
broken_sasl_auth_clients = yes
compatibility_level = 3.6
confirm_delay_cleared = no
delay_notice_recipient = [email protected]
delay_warning_time = 2h
disable_vrfy_command = yes
error_notice_recipient = [email protected]
header_checks = pcre:/etc/postfix/header_checks.pcre
home_mailbox = Maildir/
html_directory = /usr/share/doc/postfix/html
import_environment = MAIL_CONFIG MAIL_DEBUG MAIL_LOGTAG TZ XAUTHORITY DISPLAY
    LANG=C RESOLV_MULTI=on
inet_interfaces = all
inet_protocols = ipv4
internal_mail_filter_classes = bounce
mailbox_size_limit = 0
maximal_queue_lifetime = 5d
message_size_limit = 40960000
milter_connect_macros = j {daemon_name} {daemon_addr} v _
milter_default_action = accept
milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen}
    {auth_type}
milter_protocol = 6
milter_rcpt_macros = i b
mime_header_checks = pcre:/etc/postfix/mime_header_checks.pcre
mua_milters = unix:/var/run/opendkim/opendkim.sock
mydestination = $myhostname, localhost
mydomain = bristolweb.net
myhostname = mail.bristolweb.net
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 46.33.129.43
185.35.151.92 185.35.151.93 185.35.151.97 185.35.151.100 185.35.151.102
    185.35.148.202
mynetworks_style = host
myorigin = $myhostname
non_smtpd_milters = unix:/var/run/opendkim/opendkim.sock
notify_classes = software, delay, bounce, 2bounce, resource, protocol, data
policy-spf_time_limit = 3600s
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
relay_domains = mysql:/etc/postfix/mysql-relay-domains.cf
relay_recipient_maps = mysql:/etc/postfix/mysql_relay_recipients.cf
relayhost =
smtp_header_checks = pcre:/etc/postfix/smtp_header_checks.pcre
smtp_host_lookup = dns
smtp_tls_loglevel = 1
smtp_tls_note_starttls_offer = yes
smtp_tls_security_level = none
smtpd_banner = $myhostname ESMTP
smtpd_client_restrictions = permit_mynetworks permit_sasl_authenticated
    reject_unknown_client_hostname reject_unauth_pipelining
smtpd_data_restrictions = reject_unauth_pipelining, permit
smtpd_delay_reject = yes
smtpd_discard_ehlo_keywords = pipelining
smtpd_forbid_bare_newline = yes
smtpd_forbid_bare_newline_exclusions = $mynetworks
smtpd_forbid_unauth_pipelining = yes
smtpd_hard_error_limit = 6
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks permit_sasl_authenticated
check_helo_access pcre:/etc/postfix/white_bypass.pcre check_client_access
    cidr:/etc/postfix/ip_check_whitelist reject_invalid_helo_hostname
    reject_non_fqdn_helo_hostname reject_unknown_helo_hostname
check_client_access cidr:/etc/postfix/ip_check_blacklist check_helo_access
    pcre:/etc/postfix/helo_checks.pcre reject_unauth_pipelining permit
smtpd_milters = unix:/var/run/opendkim/opendkim.sock,
unix:/var/run/opendmarc/opendmarc.sock, unix:/var/run/spamass/spamass.sock,
    unix:/var/run/clamav/clamav-milter.ctl
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination reject_non_fqdn_hostname reject_non_fqdn_recipient
    reject_unknown_recipient_domain reject_invalid_hostname
    reject_unauth_pipelining reject_unverified_recipient
    reject_unlisted_recipient check_recipient_access
    pcre:/etc/postfix/recipient_checks.pcre check_policy_service
unix:private/policy-spf reject_rbl_client zen.spamhaus.org=127.0.0.[2..11] reject_rhsbl_sender dbl.spamhaus.org=127.0.1.[2..99] reject_rhsbl_helo
    dbl.spamhaus.org=127.0.1.[2..99] reject_rhsbl_reverse_client
    dbl.spamhaus.org=127.0.1.[2..99] warn_if_reject reject_rbl_client
    zen.spamhaus.org=127.255.255.[1..255] permit
smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated,
    reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous nodictionary
smtpd_sasl_type = dovecot
smtpd_sender_restrictions = permit_mynetworks permit_sasl_authenticated
    reject_unauth_pipelining check_sender_mx_access
    cidr:/etc/postfix/sender_mx_access check_sender_access
    pcre:/etc/postfix/sender_whitelist.pcre reject_non_fqdn_sender
reject_unknown_sender_domain reject_unlisted_sender check_sender_access
    pcre:/etc/postfix/sender_checks.pcre
smtpd_soft_error_limit = 4
smtpd_tls_chain_files = /etc/letsencrypt/live/mail.bristolweb.net/privkey.pem
    /etc/letsencrypt/live/mail.bristolweb.net/fullchain.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_use_tls = yes
smtputf8_enable = no
strict_rfc821_envelopes = yes
transport_maps = mysql:/etc/postfix/mysql_transport.cf
unknown_address_reject_code = 553
unknown_client_reject_code = 571
unknown_hostname_reject_code = 571
unverified_recipient_reject_code = 550
virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf
virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
virtual_transport = lmtp:unix:private/dovecot-lmtp



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--
 Bill Cole
 [email protected] or [email protected]
(AKA @[email protected] and many *@billmail.scconsult.com addresses)
 Not Currently Available For Hire
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