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::Send::SMTP(3pm)					User Contributed Perl Documentation				    Email::Send::SMTP(3pm)

NAME
Email::Send::SMTP - Send Messages using SMTP SYNOPSIS
use Email::Send; my $mailer = Email::Send->new({mailer => 'SMTP'}); $mailer->mailer_args([Host => 'smtp.example.com:465', ssl => 1]) if $USE_SSL; $mailer->send($message); DESCRIPTION
This mailer for "Email::Send" uses "Net::SMTP" to send a message with an SMTP server. The first invocation of "send" requires an SMTP server arguments. Subsequent calls will remember the the first setting until it is reset. Any arguments passed to "send" will be passed to "Net::SMTP->new()", with some exceptions. "username" and "password", if passed, are used to invoke "Net::SMTP->auth()" for SASL authentication support. "ssl", if set to true, turns on SSL support by using "Net::SMTP::SSL". SMTP can fail for a number of reasons. All return values from this package are true or false. If false, sending has failed. If true, send succeeded. The return values are "Return::Value" objects, however, and contain more information on just what went wrong. Here is an example of dealing with failure. my $return = send SMTP => $message, 'localhost'; die "$return" if ! $return; The stringified version of the return value will have the text of the error. In a conditional, a failure will evaluate to false. Here's an example of dealing with success. It is the case that some email addresses may not succeed but others will. In this case, the return value's "bad" property is set to a list of bad addresses. my $return = send SMTP => $message, 'localhost'; if ( $return ) { my @bad = @{ $return->prop('bad') }; warn "Failed to send to: " . join ', ', @bad if @bad; } For more information on these return values, see Return::Value. ENVELOPE GENERATION The envelope sender and recipients are, by default, generated by looking at the From, To, Cc, and Bcc headers. This behavior can be modified by replacing the "get_env_sender" and "get_env_recipients" methods, both of which receive the Email::Simple object and their only parameter, and return email addresses. SEE ALSO
Email::Send, Net::SMTP, Net::SMTP::SSL, Email::Address, Return::Value, perl. AUTHOR
Current maintainer: Ricardo SIGNES, <rjbs@cpan.org>. Original author: Casey West, <casey@geeknest.com>. COPYRIGHT
Copyright (c) 2004 Casey West. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.4 2009-07-12 Email::Send::SMTP(3pm)