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Configuring Email

IXP Manager uses Laravel's mail system to send email. This system allows for many possible email sending drivers (such as Mailgun, Postmark, Amazon SES, etc.). If you wish to use one of these services than please refer to the official documentation. You can also read the config/mail.php configuration file in your IXP Manager installation for further details.

This guide will explain how to configure and test IXP Manager to send email using a standard SMTP service.

Configuring SMTP

A sample SMTP configuration block in your IXP Manager .env file would be:

# MAIL_HOST="localhost"
# MAIL_PORT="25"

The options that are commented out above show defaults. Under the hood, Laravel in turn uses swiftmailer and the parameters above are passed through to that library.

The configuration options for SMTP in the .env file are as follows.

MAIL_MAILER="smtp" - this is the mail transport to use. The default is to try and use a local sendmail binary so it is important to set this. The other available options are outside the scope of this documentation.

MAIL_HOST is the hostname or IP address of your SMTP relay server. We would generally expect an IXP to have an internal SMTP relay server within the management network to handle the sending of email from monitoring systems, cron processes, IXP Manager, etc. This can also be localhost or if you are running a local daemon such as Postfix.

MAIL_PORT is the TCP port which the mail relay server listens for connections. Typical values are 587 for TLS encrypted mail servers and 25 for unencrypted mail servers (these should be on your local network only - if you are using a third party or remote relay service, you should use TLS or SSL encryption).

MAIL_ENCRYPTION can be "tls" or "ssl" for encryption. If you are using localhost or an internal relay server without encryption, set this to MAIL_ENCRYPTION=false. NB: this is important as the default is to use TLS encryption.

Finally, MAIL_USERNAME and MAIL_PASSWORD can be set if your mail relay server requires authentication. If unset, then no authentication is assumed (which is the default).

A local SMTP relay server on the same host as IXP Manager would therefore require a configuration such as:


Sender Identity

IXP Manager sends emails using the name and email address configured in the following .env parameters:


Where ${IDENTITY_LEGALNAME} means use the value as configured in the IDENTITY_LEGALNAME .env parameter.

You should set these as appropriate to your IXP.

Testing SMTP

A new Artisan SMTP test utility was introduced in IXP Manager >v5.7.0. You can run it as follows:

$ php artisan utils:smtp-mail-test [-v] {recipient-email}

A example of a working test run looks like this:

$ php artisan utils:smtp-mail-test
This utility allows you to test your SMTP settings to verify that IXP Manager can send email.

Testing using the following parameters:

| Driver     | smtp                |
| Host       | localhost           |
| Port       | 25                  |
| Encryption |                     |
| Username   |                     |
| Password   |                     |
| From Name  | INEX DEV IXP        |
| From Email | |

Trying to send email...

SUCCESS - email has been sent.

If you add the verbose option you will also be shown the SMTP dialog:

$ php artisan utils:smtp-mail-test -v


SMTP Dialog:

++ Starting Swift_SmtpTransport
<< 220 ESMTP Postfix

>> EHLO []

250-SIZE 80200000


<< 220 2.0.0 Ready to start TLS


If there is an error sending an email, it will provide the exception thrown and the error message:

Trying to send email...


Exception thrown: ErrorException
Error: stream_socket_enable_crypto(): Peer certificate CN=`' did not match expected CN=`'
File: /tmp/dev/ixpm/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php
Line: 94

Similarly, if you provide the verbose option in the case of an error, you will be provided with a stack trace and the SMTP dialog.

Last update: August 25, 2020