Sendmail migration help

 
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Operating Systems Linux Red Hat Sendmail migration help
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Old 03-15-2017
Sendmail migration help

I am currently trying to move away from an old email server to Google mail for business. As email is critical for everyone in the company we are trying to do it gradually to minimise the risk of emails getting lost or something going wrong.



Our existing email server uses sendmail 8.13.8 as the MTA. We also have MX records for the domain pointing to this old email server. We have a google mail inbox but it currently receives nothing as there aren't any MX records pointing at it.



We are hoping to set up some sort of forwarding system so that our users can be migrated gradually. The idea would be that when someone sends a user an email, the mail server would either deliver it locally (as it currently does) or forward it to the google mail server (that has no MX record) to be delivered there depending on whether the user has been flagged for migration. We could then gradually test the system with a few users and give them a chance to copy their existing mailboxes over to the new storage before we finally switch the MX record over to Google.


Does anyone have any idea if this is possible and how to go about doing it?
If anyone has any better ideas about doing this migration I'd also love to hear them.


Thanks in advance!
James
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Log::Handler::Output::Sendmail(3pm)			User Contributed Perl Documentation		       Log::Handler::Output::Sendmail(3pm)

NAME
Log::Handler::Output::Sendmail - Log messages with sendmail. SYNOPSIS
use Log::Handler::Output::Sendmail; my $email = Log::Handler::Output::Sendmail->new( from => 'bar@foo.example', to => 'foo@bar.example', subject => 'your subject', ); $email->log(message => $message); DESCRIPTION
With this output module it's possible to log messages via "sendmail". METHODS
new() Call "new()" to create a new Log::Handler::Output::Sendmail object. The following options are possible: from The sender address (From). to The receipient address (To). cc Carbon Copy (Cc). bcc Blind Carbon Copy (Bcc) subject The subject of the mail. sender This option is identical with "sendmail -f". header With this options it's possible to set your own header. my $email = Log::Handler::Output::Sendmail->new( from => 'bar@foo.example', to => 'foo@bar.example', header => 'Content-Type: text/plain; charset= UTF-8', ); Or my $email = Log::Handler::Output::Sendmail->new( header => { From => 'bar@foo.example', To => 'foo@bar.example', Subject => 'my subject', 'Content-Type' => text/plain; charset= UTF-8', } ); Or my $email = Log::Handler::Output::Sendmail->new( header => [ 'From: bar@foo.example', 'To: foo@bar.example', 'Subject: my subject', 'Content-Type: text/plain; charset= UTF-8', ] ); sendmail The default is set to "/usr/sbin/sendmail". params Parameters for "sendmail". The default is set to "-t". maxsize Set the maximum size of the buffer in bytes. All messages will be buffered and if "maxsize" is exceeded the buffer is flushed and the messages will be send as email. The default is set to 1048576 bytes. Set 0 if you want no buffering and send a mail for each log message. debug Set 1 if you want to enable debugging. The messages can be fetched with $SIG{__WARN__}. log() Call "log()" if you want to log a message as email. $email->log(message => "this message will be mailed"); If you pass the level then its placed into the subject: $email->log(message => "foo", level => "INFO"); $email->log(message => "bar", level => "ERROR"); $email->log(message => "baz", level => "DEBUG"); The lowest level is used: Subject: ERROR ... You can pass the level with "Log::Handler" by setting message_pattern => '%L' flush() Call "flush()" if you want to flush the buffered messages. validate() Validate a configuration. reload() Reload with a new configuration. errstr() This function returns the last error message. DESTROY
"DESTROY" is defined and called "flush()". PREREQUISITES
Carp Params::Validate EXPORTS
No exports. REPORT BUGS
Please report all bugs to <jschulz.cpan(at)bloonix.de>. If you send me a mail then add Log::Handler into the subject. AUTHOR
Jonny Schulz <jschulz.cpan(at)bloonix.de>. COPYRIGHT
Copyright (C) 2007-2009 by Jonny Schulz. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-11-21 Log::Handler::Output::Sendmail(3pm)