Mail Systems

exim

• configuring first install of exim in Debian/Ubuntu

dpkg-reconfigure exim4-config

• General type of mail configuration: internet site; mail is sent and received directly using SMTP
• System mail name: <the FQDN of the host>
• IP-addresses to listen on for incoming SMTP connections: 127.0.0.1
• Other destinations for which mail is accepted: <blank>
• Domains to relay mail for: <blank>
• Machines to relay mail for: <blank>
• Keep number of DNS-queries minimal (Dial-on-Demand)? No
• Delivery method for local mail: mbox format in /var/mail/
• Split configuration into small files? No

commands

• see the queue:

mailq

• • or

exim -bp

the output shows the message queue giving useful information to work with it:

 root:~# mailq
 24h   379 1QC8cA-0001iy-B3 <ciaotest@server.company>
           hellobye@server.company.nl
*; 1QC8cA-0001iy-B3: message ID (corresponds to a filename)
*; 24h : time msg spent in the queue
*; 379:  the size in bytes.

• find a queued message:

find /var/spool/ -name "1QC8cA-0001iy-B3*"

• to un-queue messages, I delete the files found by the find command (to rude maybe?)... it works

• flush the queue:

runq

• or

exim -q

• • flush queue forcing frozen messages to be sent

exim -qf 

• • flush queue forcing frozen/non-frozen messages to be sent

exim -qff

• Prints run time configuration:

exim4 -bP

• testing relay emulating a host:

/usr/sbin/exim -bh 192.168.1.1

mail from:info@domain.com rcpt to:webmaster@otherdomain.com

configuration

• this options will make exim act as a secondary MX of anyone listing your server in the DNS :

domainlist relay_to_domains = @mx_secondary

• this uses a file instead:

domainlist relay_to_domains =  ${lookup{$domain}partial-lsearch{/etc/relay_to_domains}}

postfix

command line

• enabling SMTP relay:

Restriction list name 	Status 	Effect of REJECT or DEFER result
smtpd_client_restrictions 	Optional 	Reject all client commands
smtpd_helo_restrictions 	Optional 	Reject HELO/EHLO information
smtpd_sender_restrictions 	Optional 	Reject MAIL FROM information
smtpd_recipient_restrictions 	Required 	Reject RCPT TO information
smtpd_data_restrictions 	Optional 	Reject DATA command
smtpd_end_of_data_restrictions 	Optional 	Reject END-OF-DATA command
smtpd_etrn_restrictions 	Optional 	Reject ETRN command

show queue

mailq 

flush the mail queue

postfix flush

remove all the mail from the queue (delete it)

postsuper -d ALL

find email address in queue

(postsuper manual)

for a in `mailq |  grep -v '^ *(' | awk  'BEGIN { RS = "" } { if ($8 == "service@visaitalia.com" && $9 == "") print $1 } ' | tr -d '*!'`; do echo "---$a";ls -l ./*/$a; done;

mailq | tail -n +2 | awk 'BEGIN { RS = "" } / info@mail\.com$/ { print $1 }' | tr -d '*!' | postsuper -d -

postqueue -p | tail -n +2 | awk 'BEGIN { RS = "" } / info@email\.net/ { print $1 }' | tr -d '*!' | postsuper -d -

re-process the queue

postqueue -f

• or...

pfqueue

canonical rewrite

vi /etc/postfix/canonical

femmes:~# postmap /etc/postfix/canonical

• unix user e-mail

domain-name      name@domain.com

• generating a report and sending it:

/usr/sbin/sendmail -v <an e-mail>

configuration

#mynetworks = hash:/etc/postfix/network_table
#relay_domains = $mydestination
#relayhost = $mydomain
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
#home_mailbox = Maildir/
debug_peer_level = 2
#debug_peer_list = 127.0.0.1
#header_checks = regexp:/etc/postfix/header_checks

Dovecot

Troubleshoot

ssl enabled, but ssl_cert not set

• get rid of those "<" characters !!!

OpenPEC2

• developers stopped supporting the software and any company involved in the development has no working website anymore

(http://www.exentrica.it/

• documentation (very poor): http://openpec.sourceforge.net/doc_instopec.shtml
• download https://sourceforge.net/projects/openpec/
• the code is outdated and not in line with libSSL1.1. To make it work today (october 2020) I had to install a second copy of libSSL in the syestem (so 1.0 + 1.1) very dirty solution

https://packages.debian.org/jessie/amd64/libssl-dev/download
https://packages.debian.org/jessie/amd64/libssl1.0.0/download

dpkg -i libssl1.0.0_1.0.1t-1+deb8u12_amd64.deb
dpkg -i libssl-dev_1.0.1t-1+deb8u12_amd64.deb

• Debian repo dependencies:

apt install libtest-net-ldap-perl  libio-stringy-perl libunix-syslog-perl libsys-sigaction-perl  libnet-httpserver-perl libmime-tools-perl zlib1g-dev

• Perl deps. (this will not compile with libSSL >= 1.1

cpan Crypt::SMimeEngine

mailman

• show all lists

/var/lib/mailman/bin/list_lists

• show pending messages

/var/lib/mailman/bin/show_qfiles /var/lib/mailman/qfiles/shunt/*.pck

• re-queque shunted messages

/var/lib/mailman/bin/unshunt
# on another terminal
tail -f /var/log/mail.log

• find the parent list of an address:

 for lista in `/usr/lib/mailman/bin/list_lists -b`; do  /usr/lib/mailman/bin/list_members $lista|grep <indirizzo> && echo $lista; done

virtual hosts

• in the file:

/etc/mailman/mm_cfg.py