Email Server High Availability


 
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Old 03-09-2016
Email Server High Availability

Hello,

We are planning to setup a Email server with High Availability for email services so that if SMTP/POP/IMAP goes down on one server, the services switch to second server.
We are planning to use a Linux machines from a hosting provider and will do it using DNS with multiple MX records with round robin.

Now i have couple of queries regarding this setup :-
  • Is this possible to have a same domain name to bind with 2 IPs i.e xyz.com point to 1.1.1.1 on one server and xyz.com point to 2.2.2.2 on second server.
  • How can we setup MX records for each server on DNS for email failover.
  • As we have a separate servers for this setup that means data related to email would be reside on separate server (because they have separate HDD), so in case 1st server goes down and it switch to second server, will i skipped my email which was received on 1st server before it goes down as my email client will receive them on certain period of time.

Please let me know if above is a valid query.
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Email::Sender::Transport::SMTP::TLS(3pm)		User Contributed Perl Documentation		  Email::Sender::Transport::SMTP::TLS(3pm)

NAME
Email::Sender::Transport::SMTP::TLS - Email::Sender with Net::SMTP::TLS (Eg. Gmail) VERSION
version 0.10 SYNOPSIS
use Email::Sender::Simple qw(sendmail); use Email::Sender::Transport::SMTP::TLS; use Try::Tiny; my $transport = Email::Sender::Transport::SMTP::TLS->new( host => 'smtp.gmail.com', port => 587, username => 'username@gmail.com', password => 'password', helo => 'fayland.org', ); # my $message = Mail::Message->read($rfc822) # || Email::Simple->new($rfc822) # || Mail::Internet->new([split / /, $rfc822]) # || ... # || $rfc822; # read L<Email::Abstract> for more details use Email::Simple::Creator; # or other Email:: my $message = Email::Simple->create( header => [ From => 'username@gmail.com', To => 'to@mail.com', Subject => 'Subject title', ], body => 'Content.', ); try { sendmail($message, { transport => $transport }); } catch { die "Error sending email: $_"; }; DESCRIPTION
Email::Sender replaces the old and sometimes problematic Email::Send library, while this module replaces the Email::Send::SMTP::TLS. It is still alpha, but it works. use it at your own risk! ATTRIBUTES The following attributes may be passed to the constructor: host - the name of the host to connect to; defaults to localhost port - port to connect to; defaults to 587 username - the username to use for auth; required password - the password to use for auth; required helo - what to say when saying HELO; no default allow_partial_success - if true, will send data even if some recipients were rejected PARTIAL SUCCESS If "allow_partial_success" was set when creating the transport, the transport may return Email::Sender::Success::Partial objects. Consult that module's documentation. AUTHOR
Fayland Lam <fayland@gmail.com> COPYRIGHT AND LICENSE
This software is copyright (c) 2011 by Fayland Lam. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.14.2 2012-06-25 Email::Sender::Transport::SMTP::TLS(3pm)