I'm on ISPCONFIG 3.0.5 Center 6.5., Mails I sent to yahoo is rejected with error Message Header not RFC compliant 291. I know this double message headers issue was fixed in 3.1 but is there a work around for 3.0.5 I'm wary about upgrading to 3.1at this time. I'm using courier instead of dovecot on ISPCONFIG 3.0.5 will I get any problems if I upgrade to 3.1
I highly discourage using 3.0.5 since it already receives no updates for a long time – even security-related ones. That said I fear there is no easy way using patches from 3.1. Do you mean mails that you send by hand? The Patch in 3.1 was only related to mails being sent directly from inside ISPConfig (e. g. quota warning).
That's not an answer to my question Does it occur when you send Mails from your mail client on your computer or does it occur on mails sent by ISPConfig, e.g. quota warnings?
For now only on mails sent from mail client on my computer. From my investigation it started when I created a second domain on ISPCONFIG with a separate Ipv4 address
That does not sound like being related to ISPConfig. The bug you mentioned that was fixed only affected mails sent by the ISPConfig system, not those sent by mail clients, as far as I know. Have you investigated, which header exactly is doubled?
What mail client are you using and have you set something like "send (outgoing) copy to" or an additional external forwarding for your mail address?
Contents of /etc/postfix/main.cf Code: readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES virtual_alias_domains = virtual_alias_maps = hash:/etc/mailman/virtual-mailman, proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy: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_mailbox_base = /var/vmail virtual_uid_maps = static:5000 virtual_gid_maps = static:5000 smtpd_sasl_auth_enable = yes broken_sasl_auth_clients = yes smtpd_sasl_authenticated_header = yes smtpd_recipient_restrictions = reject_authenticated_sender_login_mismatch, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_invalid_hostname, reject_non_fqdn_hostname, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_maps_rbl, check_relay_domains, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf smtpd_use_tls = yes smtpd_tls_security_level = may smtpd_tls_CAfile = /etc/letsencrypt/live/xxxxxxxxxxx.com/chain.pem smtpd_tls_cert_file = /etc/postfix/smtpd.cert smtpd_tls_key_file = /etc/postfix/smtpd.key transport_maps = hash:/var/lib/mailman/data/transport-mailman, proxy:mysql:/etc/postfix/mysql-virtual_transports.cf relay_domains = mysql:/etc/postfix/mysql-virtual_relaydomains.cf relay_recipient_maps = mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf 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 $smtpd_sender_login_maps smtpd_sender_restrictions =check_sender_access mysql:/etc/postfix/mysql-virtual_sender.cf, reject_unknown_sender_domain, reject_unlisted_sender, reject_sender_login_mismatch smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-virtual_client.cf smtpd_client_message_rate_limit = 100 maildrop_destination_concurrency_limit = 1 maildrop_destination_recipient_limit = 1 virtual_transport = maildrop header_checks = regexp:/etc/postfix/header_checks mime_header_checks = regexp:/etc/postfix/mime_header_checks nested_header_checks = regexp:/etc/postfix/nested_header_checks body_checks = regexp:/etc/postfix/body_checks smtp_tls_security_level = may smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3 smtpd_tls_protocols = !SSLv2,!SSLv3 smtp_tls_protocols = !SSLv2,!SSLv3 myhostname = server.xxxxxxxxxxx.com mynetworks = 127.0.0.0/8 [::1]/128 xxx.xxx.45.124 xxx.xxx.233.104 content_filter = amavis:[127.0.0.1]:10024 receive_override_options = no_address_mappings smtpd_milters = inet:127.0.0.1:8891 non_smtpd_milters = $smtpd_milters milter_default_action = accept milter_protocol = 2 message_size_limit = 0 relayhost = mailbox_size_limit = 0 smtpd_helo_required = yes disable_vrfy_command = yes strict_rfc821_envelopes = yes invalid_hostname_reject_code = 554 multi_recipient_bounce_reject_code = 554 non_fqdn_reject_code = 554 relay_domains_reject_code = 554 unknown_address_reject_code = 554 unknown_client_reject_code = 554 unknown_hostname_reject_code = 554 unknown_local_recipient_reject_code = 554 unknown_relay_recipient_reject_code = 554 unknown_sender_reject_code = 554 unknown_virtual_alias_reject_code = 554 unknown_virtual_mailbox_reject_code = 554 unverified_recipient_reject_code = 554 unverified_sender_reject_code = 554 maps_rbl_domains = dsn.rfc-ignorant.org, dul.dnsbl.sorbs.net, list.dsbl.org, sbl-xbl.spamhaus.org, bl.spamcop.net, dnsbl.sorbs.net, cbl.abuseat.org, ix.dnsbl.manitu.net, combined.rbl.msrbl.net, rabl.nuclearelephant.com smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender_login_maps.cf Thanks
