Email relay via Office 365 / Exchange Online

Office 365

This is a quick tutorial to setup Email Relay using Office 365 or Exchange Online services.


  • Office 365 / Exchange Online Account
  • Static IP address at your site (from where emails will be sent)

JComments - can't disable CAPTCHA


Not possible to disable CAPTCHA for Public user group in Settings > Permissions > Public (JComments 3.0.0). After saving the changes "Enable CAPTCHA" check-box gets checked again.


The issue is a bug confirmed by JComments developer "smart" here.

Incorrect MTU causes websites not to load at all or load incomplete


A small office reported an issue with their Internet connection - some websites wouldn't load at all, some load incompletely, and others work absolutely fine. The office had a SonicWALL NSA220 firewall connecting to the Internet via BT OpenReach VDLS modem (over PPPoE). Standard network / Internet connectivity tests didn't show any problems. 

Website not loading

Godaddy SMTP server randomly rejects emails

I have a few websites that run Joomla and send some notification emails via Godaddy SMTP server Godaddy only allows 250 SMTP relays per day for free, but for this particular purpose this was more than enough.

One day I noticed that I was not receiving all notification emails I was supposed to receive. First of all all I logged on to Joomla's administration panel and tried to send some test emails using Joomla's built-in Mass Mail functionality. Results were interesting - most of the time emails would go through, but around 30% of the time sending would fail with error:

Message - The following from address failed

The following from address failed: This email address is being protected from spambots. You need JavaScript enabled to view it.


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