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Postfix smtp slow speed (delay) when sending e-mail

gkoo — Tue, 06 Jul 2010 16:35:28 +0000

We own 2 mail-servers running the same configuration postfix + courier + mysql_auth etc.
The servers have the same configuration but one of them had 3-4 seconds delays when sending e-mail.

After a bunch of hours of testing and retesting i found out that the DNS was faulty.
The first server had it’s own dns server running on localhost, the second one (the one with the delays) connected to our provider’s dns.
I’ve installed a bind nameserver on the second server and all is ok now.

Hope it helps.

HowTo: bcc all recieved or sent mail from your postfix server

gkoo — Thu, 27 Nov 2008 16:03:54 +0000

Postfix has the option to bcc all sent or recieved emails for a specific domain.

You can bcc all recieved mails for a specific by inserting the following in to /etc/postfix/main.cf :

recipient_bcc_map = pcre:/etc/postfix/bcc_recipient

then edit the file /etc/postfix/bcc_recipient and add your domain like this :

/(.*)@(example.com)/ backup@example.com

then at the console type postmap /etc/postfix/bcc_recipient to load the bcc recipients database. This will create the file /etc/postfix/bcc_recipient.pcre which is the database for bcc recipients.

Run postfix reload to insert the new options in postfix’s config. Now all the e-mails for example.com will be automatically bcc-ed to backup@example.com

______________

If you want to bcc al sent e-mails from a specific domain do the following :

Insert the following into /etc/postfix/main.cf :

sender_bcc_map = pcre:/etc/postfix/bcc_sender

then edit the file /etc/postfix/bcc_sender and add your domain like this :

/(.*)@(example.com)/ backup@example.com

then at the console type postmap /etc/postfix/bcc_sender to load the bcc senderdatabase. This will create the file /etc/postfix/bcc_sender.pcre which is the database for bcc senders.

Run postfix reload to insert the new options in postfix’s config. Now every e-mail sent from example.com will get bcc-ed to backup@example.com

HowTo : add custom transport routes (maps) in postfix.

gkoo — Wed, 29 Oct 2008 10:13:27 +0000

In postfix, when you need your e-mails for some specific domains to relay through another server ( your ip is blocked or for some other reason ) you can specify custom transport maps in the postfix config.

You have to setup postfix to use custom transport maps :

in main.cf enable the transport_maps directive :

transport_maps = hash:/etc/postfix/transport

then edit the file /etc/postfix/transport and add to it :

example.com smtp:your.second.mailserver.com

close it and then rebuild the transport database file by entering the following command :

postmap /etc/postfix/transport

restart postfix and now every e-mail sent to example.com will relay through your specified e-mail server.