Debugging mail delivery

If you find that emails aren't being delivered, there are some basics to check first to rule out your application and your DNS settings before escalating an issue with the support team.

Check if PHP is sending mails

Using a standalone PHP script (to rule out Magento/WordPress etc.), create a simple PHP file in the document root with your email as the recipient and view it in a web browser (replace the domain and email address with your own respectively),

Eg. https://www.example.com/mail.php

<?php var_dump(mail('info@example.com', 'info@example.com', 'info@example.com'));

• If you see bool(false), something fatal has gone wrong and it is best submitting a support ticket
• If you see bool(true) displayed on screen but no email in your inbox, it is likely SPF or DKIM
• If you see bool(true) displayed on screen and an email in your inbox confirms that PHP is sending emails
• If you see bool(true) displayed on screen and an email in your inbox, but you still don't see your emails from Magento, its likely Magento is misconfigured

Magento is misconfigured

Some emails in Magento are sent immediately, some are sent on a schedule, initiated via cron.

• If no emails at all are being sent by Magento then it is highly likely that Magento is misconfigured, perhaps a hardcoded mail server that doesn't exist or a 3rd party module trying to handle its own mail delivery.
• If some emails are sent, but not all, check that your cron is properly configured.

Mail quality issues (DNS, SPAM etc.)

In the event of DNS (DKIM or SPF) being a likely cause for undelivered mail, it is recommended to send a test email (from your application) to the grading service at https://mail-tester.com - this will provide valuable insight into mail quality issues.

Viewing mail logs

To access mail logs, you can view them either,

• By File: In /microcloud/logs_ro/mail

  Eg. To find emails sent to info@example.com on 16-08-2018

  zgrep info@example.com /microcloud/logs_ro/mail/postfix-2018-08-16*
  
  2018-08-16 17:12:46 UTC /smtp[4965]: DC1DAA6176: to=info@example.com, relay=mx1.emailsrvr.com[184.106.54.1]:25, delay=1.5, delays=0.07/0.01/0.96/0.43, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as F2/7B-22170-D80B57B5)
  2018-08-16 17:12:46 UTC Aug 16 18:12:46 mail1 postfix/smtp[4965]: DC1DAA6176: to=info@example.com, relay=mx1.emailsrvr.com[184.106.54.1]:25, delay=1.5, delays=0.07/0.01/0.96/0.43, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as F2/7B-22170-D80B57B5)

• By GUI: In Kibana

  Eg. Using the search term msg:info@example.com

In particular, you are looking at the status=sent line, confirming the mail was delivered successfully. If the mail is marked as sent, but you didn't receive it, then its likely a DNS issue (DKIM or SPF).