Add HELO link

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Marcus Bointon 2020-07-15 20:31:23 +02:00
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@ -11,6 +11,7 @@ When working on email sending code you'll find yourself worrying about what migh
* [smtp-sink](http://www.postfix.org/smtp-sink.1.html), part of the Postfix mail server, so you may have this installed already. This is used in the Travis-CI configuration to run PHPMailer's unit tests.
* [smtp4dev](https://github.com/rnwood/smtp4dev), a dummy SMTP server for Windows and Linux.
* [fakesendmail.sh](https://github.com/PHPMailer/PHPMailer/blob/master/test/fakesendmail.sh), part of PHPMailer's test setup, this is a shell script that emulates sendmail for testing 'mail' or 'sendmail' methods in PHPMailer.
* [HELO](https://usehelo.com), a very nice (commercial) mail server desktop app from BeyondCode.
* [msglint](http://tools.ietf.org/tools/msglint/), not a mail server, the IETF's MIME structure analyser checks the formatting of your messages.
Most of these examples use the `example.com` and `example.net` domains. These domains are reserved by IANA for illustrative purposes, as documented in [RFC 2606](http://tools.ietf.org/html/rfc2606). Don't use made-up domains like 'mydomain.com' or 'somedomain.com' in examples as someone, somewhere, probably owns them!