If you are like me and prefer your clients to use their own webmail tied to their domain instead of yours then you would be a little dissapointed that ISPConfig 3 doesn't allow for adding {DOMAIN} to the Server Config webmail link url. This useful change allows you to connect to the webmail server of the user. The reason I have this configured is that not all my webmails for each domain resides on the same host and can be on a number of other hosting boxes based on where the http://webmail.{domain} points to, so I can't direct it to 1 global webmail site.

There's a very small simple hack that can give you that functionality as long as you remember to use the DNS template to always add a CNAME or A record for "webmail" otherwise the url redirect fails as the DNS doesn't resolve.

By going into System->Interface Config ->Mail, you can use the steps below to allow you to redirect the webmail in ispconfig to http://webmail.{DOMAIN} which will be the domain of the mailbox you are selecting.

Instruction Steps

1. Edit the file /usr/local/ispconfig/interface/web/admin/form/system_config.tform.php

1.a Search down for the word "webmail_url_error_regex" and you will find the regex pattern above it as below shows.

'regex' => '/^[0-9a-zA-Z\:\/\-\.]{0,255}$/',

1.b Add a curly braces into it as below and save/exit the file.

'regex' => '/^[{}0-9a-zA-Z\:\/\-\.]{0,255}$/',

2. Now edit the file /usr/local/ispconfig/interface/web/mail/webmailer.php

2.a Search for the below lines

/*
 Get the data to connect to the database
*/
$dbData = $app->db->queryOneRecord("SELECT server_id FROM mail_user WHERE mailuser_id = " . $emailId);

2.b Change the SELECT query to also extract "email" along with the "server_id" as below

/*
* Get the data to connect to the database
*/
$dbData = $app->db->queryOneRecord("SELECT server_id,email FROM mail_user WHERE mailuser_id = " . $emailId);

3. Now search further below for the if statement checking for webmail_url as below line shows

if($global_config['webmail_url'] != '') {
header('Location:' .$global_config['webmail_url']);
} else {

3.a Add the following line just after the IF statement and change the header variable seen as below.

if($global_config['webmail_url'] != '') {
$webmail_dom=split("@",$dbData['email']);
$webmail_dom=$webmail_dom[1];
$webmail_server=str_replace("{DOMAIN}",$webmail_dom,$global_config['webmail_url']);
header('Location:' . $webmail_server);
} else {

4. Log into ISPConfig3 and go into Email and Email Mailboxes. For any email address you select the "webmail" button on the right no matter what domain, it will replace the {DOMAIN} for the email domain of the user and browse to that webmail site. So if the user is This e-mail address is being protected from spambots. You need JavaScript enabled to view it , the webmail button will take you to webmail.usersdomain.com

Hope this works well for you, please contact me if you have any issues.